diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
index 3dc0ee4..5fec585 100644
--- a/src/main/java/cactusServer/entities/Area.java
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -2,10 +2,13 @@
 
 import java.util.HashSet;
 
+import net.arnx.jsonic.JSONHint;
+
 public class Area extends Entity{
 	private String name;
 	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
 	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Area() {
 		// JSONDecode���̌Ăяo���p
diff --git a/src/main/java/cactusServer/entities/Character.java b/src/main/java/cactusServer/entities/Character.java
index 671a985..289a173 100644
--- a/src/main/java/cactusServer/entities/Character.java
+++ b/src/main/java/cactusServer/entities/Character.java
@@ -4,12 +4,14 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
+import cactusServer.models.Instances;
 import cactusServer.utils.RandomStringGenerator;
 import framework.model3D.Position3D;
 import net.arnx.jsonic.JSONHint;
 
-public class Character extends Entity{
+public class Character extends Entity {
 	private String accountURI;
 	private String name;
 	private Position3D position;
@@ -17,12 +19,13 @@
 	private CharacterModel model;
 	private String areaURI;
 	private HashMap<String, Item> itemMap = new HashMap<>();
-	private static final int UNIQUE_ID_LENGTH = 12;
+	@JSONHint(ignore = true)
+	public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Character() {
 		// JSONDecode���̌Ăяo���p
 	}
-	
+
 	public Character(String accountURI, String name, Position3D position, Angle angle, CharacterModel model) {
 		setAccountURI(accountURI);
 		setName(name);
@@ -32,10 +35,20 @@
 		updateAreaURI();
 	}
 
+	public Character(String instanceId, String accountURI, String name, Position3D position, Angle angle,
+			CharacterModel model) {
+		setAccountURI(accountURI);
+		setName(name);
+		setPosition(position);
+		setAngle(angle);
+		setModel(model);
+		updateAreaURI();
+	}
+
 	public String getAccountURI() {
 		return accountURI;
 	}
-	
+
 	public String getName() {
 		return name;
 	}
@@ -43,7 +56,7 @@
 	public Position3D getPosition() {
 		return position;
 	}
-	
+
 	public Angle getAngle() {
 		return angle;
 	}
@@ -51,16 +64,16 @@
 	public CharacterModel getModel() {
 		return model;
 	}
-	
+
 	public String getAreaURI() {
 		return areaURI;
 	}
-	
+
 	@JSONHint(ignore = true)
 	public Item getItem(String itemId) {
 		return itemMap.get(itemId);
 	}
-	
+
 	@JSONHint(ignore = true)
 	public List<Item> getItems() {
 		List<Item> itemList = new ArrayList<>();
@@ -73,7 +86,7 @@
 	public void setAccountURI(String accountURI) {
 		this.accountURI = accountURI;
 	}
-	
+
 	public void setName(String name) {
 		this.name = name;
 	}
@@ -81,7 +94,7 @@
 	public void setPosition(Position3D position) {
 		this.position = position;
 	}
-	
+
 	public void setAngle(Angle angle) {
 		this.angle = angle;
 	}
@@ -89,7 +102,7 @@
 	public void setModel(CharacterModel model) {
 		this.model = model;
 	}
-	
+
 	public void setAreaURI(String areaURI) {
 		this.areaURI = areaURI;
 	}
@@ -97,13 +110,14 @@
 	public AddressedEntity createItem(String name, int amount) {
 		Item item = new Item(name, amount);
 		if (!hasItem(item)) {
-			String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, itemMap.keySet());
+			String id = RandomStringGenerator.generateUniqueString(Item.UNIQUE_ID_LENGTH,
+					RandomStringGenerator.ALPHA_NUMERIC, itemMap.keySet());
 			itemMap.put(id, item);
 			return new IDAddressedEntity(id, item);
 		}
 		return null;
 	}
-	
+
 	public boolean hasItem(Item item) {
 		for (Map.Entry<String, Item> entry : itemMap.entrySet()) {
 			if (entry.getValue().equals(item)) {
@@ -112,7 +126,7 @@
 		}
 		return false;
 	}
-	
+
 	public Item changeAmountOfItem(String itemId, int amountOfChange) {
 		Item item = itemMap.get(itemId).changeAmount(amountOfChange);
 		if (item.isEmpty()) {
@@ -120,11 +134,50 @@
 		}
 		return item;
 	}
-	
-	private void updateAreaURI() {
-		// �L�����N�^�[�̃|�W�V������p���Ăǂ̃G���A���ɂ��邩�𔻒肵�ē��Y�G���A��URI�ɍX�V����
+
+	private void initAreaURI(String instanceId) {
+		Instance instance = Instances.getInstance().getInstance(instanceId);
+		areaURI = findAreaURI(instance);
 	}
-	
+
+	private String findAreaURI(Instance instance) {
+		// �L�����N�^�[�̃|�W�V������p���Ăǂ̃G���A���ɂ��邩�𔻒肵�ē��Y�G���A��URI�ɍX�V����
+		for (String areaId : instance.getAreaIdSet()) {
+			if (isInTheArea(instance.getArea(areaId))) {
+				int subStringStartIndex = areaURI.length() - Character.UNIQUE_ID_LENGTH;
+				StringBuilder newAreaURI = new StringBuilder();
+				return newAreaURI.append(areaURI.substring(0, subStringStartIndex)).append(areaId).toString();
+			}
+		}
+		throw new IllegalStateException("Character is in the unknown area");
+	}
+
+	private boolean isInTheArea(Area area) {
+		boolean inTheArea = false;
+		for (Plain plain : area.getRegion()) {
+			// double equation = (plain.getA() * position.getX()) + (plain.getB() *
+			// position.getY())
+			// + (plain.getC() * position.getZ()) + plain.getD();
+			// inTheArea = (equation < 0);
+		}
+		return inTheArea;
+	}
+
+	private void updateAreaURI() {
+		String[] areaURISplit = areaURI.split("/"); // �c�c/instances/{instanceId}/areas/{areaId}
+		int splitSize = areaURISplit.length;
+		String instanceId = areaURISplit[splitSize - 3];
+		String previousAreaId = areaURISplit[splitSize - 1];
+		Instance instance = Instances.getInstance().getInstance(instanceId);
+		Area previousArea = instance.getArea(previousAreaId);
+		// ���݂̃L�����N�^�[�̃|�W�V�������X�V�O�ɂ����G���A���ɂ��邩�ǂ����𔻒�
+		if (isInTheArea(previousArea)) {
+			return; // �X�V�O�ɂ����G���A���ɂ���΃G���AURI��ύX����K�v�͂Ȃ�
+		}
+		// �L�����N�^�[�̃|�W�V������p���Ăǂ̃G���A���ɂ��邩�𔻒肵�ē��Y�G���A��URI�ɍX�V����
+		areaURI = findAreaURI(instance);
+	}
+
 	public Item destroyItem(String itemId) {
 		return itemMap.remove(itemId);
 	}
diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index e1b58e6..59485b2 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -30,7 +30,7 @@
 	private HashMap<String, Area> areaMap = new HashMap<>();
 	private HashMap<String, Object> objMap = new HashMap<>();
 	private HashMap<String, Character> characterMap = new HashMap<>();
-	private static final int UNIQUE_ID_LENGTH = 12;
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Instance() {
 		// JSONDecode���̌Ăяo���p
@@ -101,21 +101,21 @@
 	}
 
 	public IDAddressedEntity createArea(String name, Plain[] region, HashSet<Allowed> permissions) {
-		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, areaMap.keySet());
+		String id = RandomStringGenerator.generateUniqueString(Area.UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, areaMap.keySet());
 		Area area = new Area(name, region, permissions);
 		areaMap.put(id, area);
 		return new IDAddressedEntity(id, area);
 	}
 	
 	public IDAddressedEntity createObject(Position3D position, Velocity3D velocity, AngularVelocity3D angularVelocity, Angle angle, Attribute attribute, ObjectModel model) {
-		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, objMap.keySet());
+		String id = RandomStringGenerator.generateUniqueString(Object.UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, objMap.keySet());
 		Object object = new Object(position, velocity, angularVelocity, angle, attribute, model);
 		objMap.put(id, object);
 		return new IDAddressedEntity(id, object);
 	}
 	
 	public IDAddressedEntity createCharacter(String accountURI, String name, Position3D position, Angle angle, CharacterModel model) {
-		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, characterMap.keySet());
+		String id = RandomStringGenerator.generateUniqueString(Character.UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, characterMap.keySet());
 		Character character = new Character(accountURI, name, position, angle, model);
 		characterMap.put(id, character);
 		return new IDAddressedEntity(id, character);
diff --git a/src/main/java/cactusServer/entities/Item.java b/src/main/java/cactusServer/entities/Item.java
index 88533bb..0055397 100644
--- a/src/main/java/cactusServer/entities/Item.java
+++ b/src/main/java/cactusServer/entities/Item.java
@@ -1,8 +1,11 @@
 package cactusServer.entities;
 
+import net.arnx.jsonic.JSONHint;
+
 public class Item extends Entity{
 	private String name;
 	private int amount;
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 	
 	private Item() {
 		// JSONDecode���̌Ăяo���p
diff --git a/src/main/java/cactusServer/entities/Object.java b/src/main/java/cactusServer/entities/Object.java
index bed51eb..4cee989 100644
--- a/src/main/java/cactusServer/entities/Object.java
+++ b/src/main/java/cactusServer/entities/Object.java
@@ -3,6 +3,7 @@
 import framework.model3D.Position3D;
 import framework.physics.AngularVelocity3D;
 import framework.physics.Velocity3D;
+import net.arnx.jsonic.JSONHint;
 
 public class Object extends Entity {
 	private Position3D position;
@@ -11,6 +12,7 @@
 	private Angle angle;
 	private Attribute attribute;
 	private ObjectModel model;
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Object() {
 		// JSONDecode���̌Ăяo���p
diff --git a/src/main/java/cactusServer/entities/Player.java b/src/main/java/cactusServer/entities/Player.java
index 0c59537..adad705 100644
--- a/src/main/java/cactusServer/entities/Player.java
+++ b/src/main/java/cactusServer/entities/Player.java
@@ -2,6 +2,7 @@
 
 import cactusServer.models.Instances;
 import framework.model3D.Position3D;
+import net.arnx.jsonic.JSONHint;
 
 public class Player extends Entity {
 	private String instanceURI;
@@ -11,6 +12,7 @@
 	private Angle angle;
 	private CameraState cameraState;
 	private EmoteState emoteState;
+	@JSONHint(ignore = true) public static final int UNIQUE_ID_LENGTH = 12;
 
 	private Player() {
 		// JSONDecode���̌Ăяo���p
@@ -24,13 +26,17 @@
 		setEmoteState(new EmoteState(animationClassToStart));
 		readCharacterData(characterURI);
 	}
-
-	private void readCharacterData(String characterURI) {
+	
+	private Character getCharacter(String characterURI) {
 		String[] characterURISplit = characterURI.split("/"); // �c�c/instances/{instanceId}/characters/{characterId}
 		int splitSize = characterURISplit.length;
 		String characterId = characterURISplit[splitSize - 1];
 		String instanceId = characterURISplit[splitSize - 3];
-		Character character = Instances.getInstance().getInstance(instanceId).getCharacter(characterId);
+		return Instances.getInstance().getInstance(instanceId).getCharacter(characterId);
+	}
+
+	private void readCharacterData(String characterURI) {
+		Character character = getCharacter(characterURI);
 		setPosition(character.getPosition());
 		setAngle(character.getAngle());
 		setAreaURI(character.getAreaURI());
@@ -99,4 +105,15 @@
 	public void updateEmoteType(EmoteState.EmoteType animationClassToStart) {
 		this.emoteState.setEmoteType(animationClassToStart);
 	}
+	
+	public void deletePlayer() {
+		writeCharacterData(characterURI);
+	}
+	
+	private void writeCharacterData(String characterURI) {
+		Character character = getCharacter(characterURI);
+		character.setPosition(position);
+		character.setAngle(angle);
+		character.setAreaURI(areaURI);
+	}
 }
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index 13aae02..f68c77c 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -21,7 +21,7 @@
 	private static Instances theInstance = null;
 	private HashMap<String, Instance> instanceMap = new HashMap<>(); // instance��ID�Ǝ��̂��Ǘ�
 	private HashMap<String, Player> playerMap = new HashMap<>();
-	private static final int UNIQUE_ID_LENGTH = 12;
+//	private static final int UNIQUE_ID_LENGTH = 12;
 
 	private Instances() {
 
@@ -48,7 +48,7 @@
 	 * @return
 	 */
 	public IDAddressedEntity createInstance(String name, Instance.State state, String stageModel) {
-		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
+		String id = RandomStringGenerator.generateUniqueString(Instance.UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
 				instanceMap.keySet());
 		Instance instance = new Instance(name, state, stageModel);
 		instanceMap.put(id, instance);
@@ -57,7 +57,7 @@
 
 	public IDAddressedEntity createPlayer(String instanceURI, String characterURI, CameraState cameraState,
 			EmoteState.EmoteType animationClassToStart) {
-		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
+		String id = RandomStringGenerator.generateUniqueString(Player.UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
 				playerMap.keySet());
 		Player player = new Player(instanceURI, characterURI, cameraState, animationClassToStart);
 		playerMap.put(id, player);
diff --git a/src/main/java/cactusServer/utils/MyParamConverterProvider.java b/src/main/java/cactusServer/utils/MyParamConverterProvider.java
index 1f5f41a..61ed672 100644
--- a/src/main/java/cactusServer/utils/MyParamConverterProvider.java
+++ b/src/main/java/cactusServer/utils/MyParamConverterProvider.java
@@ -7,6 +7,12 @@
 import javax.ws.rs.ext.ParamConverterProvider;
 import javax.ws.rs.ext.Provider;
 
+/**
+ * Rest�n�N���X�̃��\�b�h�ɂ�����,�@FormParam�A�m�e�[�V�������‚����������̌^��FormParam�̐��������<br>
+ * �������Ă��Ȃ��ꍇ��, ���Y�����𖞂������������S���N���X
+ * @author r-isitani
+ *
+ */
 @Provider
 public class MyParamConverterProvider implements ParamConverterProvider {
 	@Override