diff --git a/src/main/java/cactusServer/entities/AddressedEntity.java b/src/main/java/cactusServer/entities/AddressedEntity.java
index 2b3dc80..52c55fc 100644
--- a/src/main/java/cactusServer/entities/AddressedEntity.java
+++ b/src/main/java/cactusServer/entities/AddressedEntity.java
@@ -5,19 +5,22 @@
  * @author r-isitani
  *
  */
-public class AddressedEntity {
-	private String URI;
+public abstract class AddressedEntity {
 	private Entity body;
 	
-	public AddressedEntity(String URI, Entity body) {
-		this.URI = URI;
+	protected AddressedEntity() {
+		// JSONDecode���̌Ăяo���p
+	}
+
+	public AddressedEntity(Entity body) {
 		this.body = body;
 	}
-	
-	public String getURI() {
-		return URI;
-	}
+
 	public Entity getBody() {
 		return body;
 	}
+	
+	public void setBody(Entity body) {
+		this.body = body;
+	}
 }
diff --git a/src/main/java/cactusServer/entities/Angle.java b/src/main/java/cactusServer/entities/Angle.java
index b3b6fa5..8976c0d 100644
--- a/src/main/java/cactusServer/entities/Angle.java
+++ b/src/main/java/cactusServer/entities/Angle.java
@@ -6,6 +6,10 @@
 	private double vz;
 	private double a;
 	
+	private Angle() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Angle(double vx, double vy, double vz, double a) {
 		this.vx = vx;
 		this.vy = vy;
diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
index 0801fa2..ce7b7e8 100644
--- a/src/main/java/cactusServer/entities/Area.java
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -7,6 +7,10 @@
 	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
 	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
 
+	private Area() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Area(String name, Plain[] region, HashSet<Allowed> permissions) {
 		this.name = name;
 		this.region = region;
diff --git a/src/main/java/cactusServer/entities/CameraState.java b/src/main/java/cactusServer/entities/CameraState.java
index 3801ab1..0750a0f 100644
--- a/src/main/java/cactusServer/entities/CameraState.java
+++ b/src/main/java/cactusServer/entities/CameraState.java
@@ -6,6 +6,10 @@
 	private double tilt; // �`���g(rad)
 	private double fov; // ����p(rad)
 	
+	private CameraState() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public CameraState(double distance, Angle angle, double tilt, double fov) {
 		this.distance = distance;
 		this.angle = angle;
diff --git a/src/main/java/cactusServer/entities/Character.java b/src/main/java/cactusServer/entities/Character.java
index aa0e845..36084d1 100644
--- a/src/main/java/cactusServer/entities/Character.java
+++ b/src/main/java/cactusServer/entities/Character.java
@@ -20,10 +20,12 @@
 
 	private HashMap<String, Item> itemMap = new HashMap<>();
 	private static final int UNIQUE_ID_LENGTH = 12;
-	private final String CHARACTER_URI;
 
-	public Character(String characterURI, String accountURI, String name, Position3D position, Angle angle, CharacterModel model) {
-		this.CHARACTER_URI = characterURI;
+	private Character() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
+	public Character(String accountURI, String name, Position3D position, Angle angle, CharacterModel model) {
 		this.accountURI = accountURI;
 		this.name = name;
 		this.position = position;
@@ -93,7 +95,7 @@
 		if (!hasItem(item)) {
 			String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, itemMap.keySet());
 			itemMap.put(id, item);
-			return new AddressedEntity((CHARACTER_URI + "/items/" + id), item);
+			return new IDAddressedEntity(id, item);
 		}
 		return null;
 	}
diff --git a/src/main/java/cactusServer/entities/EmoteState.java b/src/main/java/cactusServer/entities/EmoteState.java
index 4d2f606..21a3750 100644
--- a/src/main/java/cactusServer/entities/EmoteState.java
+++ b/src/main/java/cactusServer/entities/EmoteState.java
@@ -9,6 +9,10 @@
 public class EmoteState {
 	private EmoteType emoteType;
 
+	private EmoteState() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public EmoteState(EmoteType emoteType) {
 		this.emoteType = emoteType;
 	}
diff --git a/src/main/java/cactusServer/entities/IDAddressedEntity.java b/src/main/java/cactusServer/entities/IDAddressedEntity.java
new file mode 100644
index 0000000..4ca3a59
--- /dev/null
+++ b/src/main/java/cactusServer/entities/IDAddressedEntity.java
@@ -0,0 +1,22 @@
+package cactusServer.entities;
+
+public class IDAddressedEntity extends AddressedEntity{
+	private String id;
+
+	private IDAddressedEntity() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
+	public IDAddressedEntity(String id, Entity body) {
+		super(body);
+		setId(id);
+	}
+
+	public String getId() {
+		return id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+}
diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index 19af565..9e79a1b 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -34,14 +34,16 @@
 	private HashMap<String, Object> objMap = new HashMap<>();
 	private HashMap<String, Character> characterMap = new HashMap<>();
 	private static final int UNIQUE_ID_LENGTH = 12;
-	private final String INSTANCE_URI;
 
+	private Instance() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	/**
 	 * (�����͌����_�ł̉��̂���)
 	 * @param name �C���X�^���X��
 	 */
-	public Instance(String instanceID, String name, State state, StageModel stageModel) {
-		this.INSTANCE_URI = Instances.INSTANCES_URI + "/" + instanceID;
+	public Instance(String name, State state, StageModel stageModel) {
 		this.name = name;
 		this.state = state;
 		this.stage = stageModel;
@@ -55,7 +57,6 @@
 	public Instance(String name, State state) {
 		this.name = name;
 		this.state = state;
-		this.INSTANCE_URI = Instances.INSTANCES_URI + "/";
 	}
 	
 	/**
@@ -65,7 +66,6 @@
 	public Instance(String name) {
 		this.name = name;
 		this.state = State.AVAILABLE;
-		this.INSTANCE_URI = Instances.INSTANCES_URI + "/";
 	}
 
 	public String getName() {
@@ -139,22 +139,22 @@
 		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, areaMap.keySet());
 		Area area = new Area(name, region, permissions);
 		areaMap.put(id, area);
-		return new AddressedEntity((INSTANCE_URI + "/areas/" + id), area);
+		return new IDAddressedEntity(id, area);
 	}
 	
 	public AddressedEntity 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());
 		Object object = new Object(position, velocity, angularVelocity, angle, attribute, model);
 		objMap.put(id, object);
-		return new AddressedEntity((INSTANCE_URI + "/objects/" + id), object);
+		return new IDAddressedEntity(id, object);
 	}
 	
 	public AddressedEntity createCharacter(String accountURI, String name, Position3D position, Angle angle, CharacterModel model) {
 		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, characterMap.keySet());
-		String characterURI = (INSTANCE_URI + "/characters/" + id);
-		Character character = new Character(characterURI, accountURI, name, position, angle, model);
+//		String characterURI = (INSTANCE_URI + "/characters/" + id);
+		Character character = new Character(accountURI, name, position, angle, model);
 		characterMap.put(id, character);
-		return new AddressedEntity(characterURI, character);
+		return new IDAddressedEntity(id, character);
 	}
 
 	public Character updateCharacter(String characterId, Position3D position, Angle angle, CharacterModel model) {
diff --git a/src/main/java/cactusServer/entities/Item.java b/src/main/java/cactusServer/entities/Item.java
index 77ff15f..5655ddd 100644
--- a/src/main/java/cactusServer/entities/Item.java
+++ b/src/main/java/cactusServer/entities/Item.java
@@ -4,6 +4,10 @@
 	private String name;
 	private int amount;
 	
+	private Item() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Item(String name, int amount) {
 		this.name = name;
 		this.amount = amount;
diff --git a/src/main/java/cactusServer/entities/Object.java b/src/main/java/cactusServer/entities/Object.java
index 7cdea77..e91d73a 100644
--- a/src/main/java/cactusServer/entities/Object.java
+++ b/src/main/java/cactusServer/entities/Object.java
@@ -14,6 +14,10 @@
 	private Attribute attribute;
 	private ObjectModel model;
 
+	private Object() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Object(Position3D position, Velocity3D velocity, AngularVelocity3D angularVelocity, Angle angle, Attribute attribute, ObjectModel model) {
 		setPosition(position);
 		setVelocity(velocity);
diff --git a/src/main/java/cactusServer/entities/Plain.java b/src/main/java/cactusServer/entities/Plain.java
index 6d78bac..de5f57d 100644
--- a/src/main/java/cactusServer/entities/Plain.java
+++ b/src/main/java/cactusServer/entities/Plain.java
@@ -8,6 +8,10 @@
 	private double c; // ���ʂ̕����� ax+by+cz+d ��c
 	private double d; // ���ʂ̕����� ax+by+cz+d ��d
 
+	private Plain() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Plain(double a, double b, double c, double d) {
 		this.a = a;
 		this.b = b;
diff --git a/src/main/java/cactusServer/entities/Player.java b/src/main/java/cactusServer/entities/Player.java
index 8254621..48af2e2 100644
--- a/src/main/java/cactusServer/entities/Player.java
+++ b/src/main/java/cactusServer/entities/Player.java
@@ -12,6 +12,10 @@
 	private CameraState cameraState;
 	private EmoteState emoteState;
 
+	private Player() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
 	public Player(String instanceURI, String characterURI, CameraState cameraState, EmoteState.EmoteType animationClassToStart) {
 		this.instanceURI = instanceURI;
 		this.characterURI = characterURI;
diff --git a/src/main/java/cactusServer/entities/URIAddressedEntity.java b/src/main/java/cactusServer/entities/URIAddressedEntity.java
new file mode 100644
index 0000000..53b6e99
--- /dev/null
+++ b/src/main/java/cactusServer/entities/URIAddressedEntity.java
@@ -0,0 +1,22 @@
+package cactusServer.entities;
+
+public class URIAddressedEntity extends AddressedEntity{
+	private String uri;
+	
+	private URIAddressedEntity() {
+		// JSONDecode���̌Ăяo���p
+	}
+	
+	public URIAddressedEntity(String uri, Entity body) {
+		super(body);
+		setUri(uri);
+	}
+	
+	public String getUri() {
+		return uri;
+	}
+
+	public void setUri(String uri) {
+		this.uri = uri;
+	}
+}
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index 5a2f831..377c738 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -9,6 +9,7 @@
 import cactusServer.entities.AddressedEntity;
 import cactusServer.entities.CameraState;
 import cactusServer.entities.EmoteState;
+import cactusServer.entities.IDAddressedEntity;
 import cactusServer.entities.Instance;
 import cactusServer.entities.Player;
 import cactusServer.entities.StageModel;
@@ -26,7 +27,6 @@
 	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;
-	@JSONHint(ignore = true) public static final String INSTANCES_URI = "/CactusServer/rest/instances";
 	
 	private Instances() {
 
@@ -53,9 +53,9 @@
 	 */
 	public AddressedEntity createInstance(String name, Instance.State state, StageModel stageModel) {
 		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, instanceMap.keySet());
-		Instance instance = new Instance(id, name, state, stageModel);
+		Instance instance = new Instance(name, state, stageModel);
 		instanceMap.put(id, instance);
-		return new AddressedEntity((INSTANCES_URI + "/" + id), instance);
+		return new IDAddressedEntity(id, instance);
 	}
 	
 	/**
@@ -76,7 +76,7 @@
 		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC, playerMap.keySet());
 		Player player = new Player(instanceURI, characterURI, cameraState, animationClassToStart);
 		playerMap.put(id, player);
-		return new AddressedEntity((INSTANCES_URI + "/players/" + id), player);
+		return new IDAddressedEntity(id, player);
 	}
 
 	/**