diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index 68b3b5d..129a44f 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -33,7 +33,8 @@
 public class Instance extends Entity {
 	private String name;
 	private State state;
-	private String stageURI;
+	private String stageID;
+
 	private Universe universe;
 	private Ground stage;
 	private HashMap<String, Area> areaMap = new HashMap<>();
@@ -46,10 +47,10 @@
 		// JSONDecode���̌Ăяo���p
 	}
 
-	public Instance(String name, State state, String stageURI) {
+	public Instance(String name, State state, String stageID) {
 		setName(name);
 		setState(state);
-		setStage(stageURI);
+		setStageID(stageID);
 		//initUniverse();
 	}
 
@@ -57,7 +58,7 @@
 		universe = new Universe();
 
 		// stageURI�����ɂ��ēǂݍ��ރX�e�[�W�̃t�@�C����(���΃p�X)�����\��
-		String stageFileName = stageURI;
+		String stageFileName = stageID;
 
 		// �X�e�[�W��3D�f�[�^��ǂݍ��ݔz�u����
 		Object3D stageObj;
@@ -78,8 +79,8 @@
 		return state;
 	}
 
-	public String getStage() {
-		return stageURI;
+	public String getStageID() {
+		return stageID;
 	}
 
 	@JSONHint(ignore = true)
@@ -122,8 +123,8 @@
 		this.state = state;
 	}
 
-	public void setStage(String stageURI) {
-		this.stageURI = stageURI;
+	public void setStageID(String stageURI) {
+		this.stageID = stageURI;
 	}
 
 	public IDAddressedEntity createArea(String name, Plain[] region, HashSet<Allowed> permissions) {
@@ -152,12 +153,17 @@
 		characterMap.put(id, character);
 		return new IDAddressedEntity(id, character);
 	}
+	
+	public Instance update(Instance.State state) {
+		setState(state);
+		return this;
+	}
 
 	public Character updateCharacter(String characterId, Position3D position, Angle angle, String model) {
 		Character character = characterMap.get(characterId);
 		character.update(position, angle, model, null); // areaURI(��4����)�̍X�V�͌Ăяo����Ŏ����ōs����
 		return character;
-	}//
+	}
 
 	public Character destroyCharacter(String characterId) {
 		return characterMap.remove(characterId);