diff --git a/src/main/java/cactusServer/entities/Allowed.java b/src/main/java/cactusServer/entities/Allowed.java
new file mode 100644
index 0000000..37621e8
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Allowed.java
@@ -0,0 +1,5 @@
+package cactusServer.entities;
+
+public enum Allowed {
+	SHOOT, KILL;
+}
diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
index af3dddb..9c74882 100644
--- a/src/main/java/cactusServer/entities/Area.java
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -1,16 +1,15 @@
 package cactusServer.entities;
 
-import java.util.ArrayList;
-import java.util.HashMap;
+import java.util.HashSet;
 
 public class Area {
 	private String name;
-	private ArrayList<HashMap<String, Double>> region = new ArrayList<>(); // �C�ӌ‚̕��ʂ̕�����
-	private HashMap<String, Boolean> permissions = new HashMap<>(); // �G���A���ʼn”\�Ȃ��Ƃ̗���
+	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
+	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
 	
-	public Area(String name, ArrayList<HashMap<String, Double>> region, HashMap<String, Boolean> permissions) {
+	public Area(String name, Plain[] regions, HashSet<Allowed> permissions) {
 		this.name = name;
-		this.region = region;
+		this.region = regions;
 		this.permissions = permissions;
 	}
 	
@@ -18,19 +17,23 @@
 		return name;
 	}
 	
-	public ArrayList<HashMap<String, Double>> getRegion() {
+	public Plain[] getRegions() {
 		return region;
 	}
 	
-	public HashMap<String, Double> getRegion(int index) {
-		return region.get(index);
+	public Plain getRegion(int index) {
+		return region[index];
 	}
 	
-	public HashMap<String, Boolean> getPermissions() {
-		return permissions;
+	public boolean isPermission(Allowed allowed) {
+		return permissions.contains(allowed);
 	}
 	
-	public boolean getPermission(String key) {
-		return permissions.get(key);
+	public void setPermission(Allowed allowed) {
+		permissions.add(allowed);
+	}
+	
+	public void removePermission(Allowed allowed) {
+		permissions.remove(allowed);
 	}
 }
diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index 6231d89..3a2d9f2 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -1,5 +1,12 @@
 package cactusServer.entities;
 
+import java.util.HashMap;
+import java.util.HashSet;
+import cactusServer.entities.Object;
+import framework.model3D.Position3D;
+import framework.physics.AngularVelocity3D;
+import framework.physics.Velocity3D;
+
 /**
  * �C���X�^���X
  * @author ryo isitani
@@ -7,6 +14,8 @@
  */
 public class Instance {
 	private String name;
+	private HashMap<String, Area> areaMap = new HashMap<>();
+	private HashMap<String, Object> objMap = new HashMap<>();
 	
 	/**
 	 * (�����͌����_�ł̉��̂���)
@@ -19,4 +28,50 @@
 	public String getName() {
 		return name;
 	}
+	
+	public HashMap<String, Area> getAreaMap() {
+		return areaMap;
+	}
+	
+	public Area getArea(String areaId) {
+		return areaMap.get(areaId);
+	}
+	
+	public HashMap<String, Object> getObjMap() {
+		return objMap;
+	}
+	
+	public Object getObject(String objId) {
+		return objMap.get(objId);
+	}
+	
+	public Area createArea(String areaId, String name, Plain[] regions, HashSet<Allowed> permissions) {
+		if (areaMap.containsKey(areaId)) {
+			return null;
+		}
+		Area area = new Area(name, regions, permissions);
+		areaMap.put(areaId, area);
+		return area;
+	}
+	
+	public Object createObject(String objId, Position3D position, Velocity3D velocity, AngularVelocity3D angularVelocity) {
+		if (objMap.containsKey(objId)) {
+			return null;
+		}
+		Object object = new Object(position, velocity, angularVelocity);
+		objMap.put(objId, object);
+		return object;
+	}
+	
+	public Area removeArea(String areaId) {
+		return areaMap.remove(areaId);
+	}
+	
+	public Object removeObject(String objId) {
+		return objMap.remove(objId);
+	}
+	
+	public static enum InstanceState {
+		ABAILABLE, MAINTENANCE;
+	}
 }
diff --git a/src/main/java/cactusServer/entities/Plain.java b/src/main/java/cactusServer/entities/Plain.java
new file mode 100644
index 0000000..6d78bac
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Plain.java
@@ -0,0 +1,33 @@
+package cactusServer.entities;
+
+import java.util.List;
+
+public class Plain {
+	private double a; // ���ʂ̕����� ax+by+cz+d ��a
+	private double b; // ���ʂ̕����� ax+by+cz+d ��b
+	private double c; // ���ʂ̕����� ax+by+cz+d ��c
+	private double d; // ���ʂ̕����� ax+by+cz+d ��d
+
+	public Plain(double a, double b, double c, double d) {
+		this.a = a;
+		this.b = b;
+		this.c = c;
+		this.d = d;
+	}
+	
+	public double getA() {
+		return a;
+	}
+	
+	public double getB() {
+		return b;
+	}
+	
+	public double getC() {
+		return c;
+	}
+	
+	public double getD() {
+		return d;
+	}
+}
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index 04dbad1..46e7b67 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -14,7 +14,6 @@
 public class Instances {
 	private static Instances theInstance = null;
 	private HashMap<String, Instance> instanceMap = new HashMap<>(); // instance��ID�Ǝ��̂��Ǘ�
-	private HashSet<String> instanceIdSet = new HashSet<>(); // �g�p�ς�ID�̏W��
 
 	private Instances() {
 
@@ -43,7 +42,7 @@
 	 *         ������, instanceID���d�������ꍇ�͐V�KInstance���쐬������null��Ԃ�
 	 */
 	public Instance createInstance(String instanceId, String name) {
-		if (!instanceIdSet.add(instanceId)) {
+		if (instanceMap.containsKey(instanceId)) {
 			return null;
 		}
 		Instance instance = new Instance(name);