diff --git a/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
index ac631ce..f687c55 100644
--- a/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
+++ b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
@@ -1,6 +1,7 @@
 package org.ntlab.deltaExtractor;
 
 import java.util.ArrayList;
+import java.util.List;
 
 import org.ntlab.trace.FieldAccess;
 import org.ntlab.trace.FieldUpdate;
@@ -36,13 +37,17 @@
 	
 	protected static final boolean DEBUG1 = true;
 	protected static final boolean DEBUG2 = true;
-	protected final IAliasCollector defaultAliasCollector = new IAliasCollector() {
+	protected final IAliasTracker defaultAliasCollector = new IAliasTracker() {
 		@Override
 		public void changeTrackingObject(String from, String to, boolean isSrcSide) {
 		}
 		@Override
 		public void addAlias(Alias alias) {
 		}
+		@Override
+		public List<Alias> getAliasList() {
+			return null;
+		}
 	};
 	
 	public DeltaExtractor(String traceFile) {
@@ -103,7 +108,7 @@
 	 * @return ���‚������R�[�f�B�l�[�^
 	 * @throws TraceFileException
 	 */
-	protected MethodExecution callerSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, MethodExecution childMethodExecution, IAliasCollector aliasCollector) {
+	protected MethodExecution callerSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, MethodExecution childMethodExecution, IAliasTracker aliasCollector) {
 		MethodExecution methodExecution = tracePoint.getMethodExecution();
 		methodExecution.setAugmentation(new DeltaAugmentationInfo());
 		eStructure.createParent(methodExecution);
@@ -510,7 +515,7 @@
 	 * @param index�@objList���̂ǂ̃I�u�W�F�N�g��ǐՂ��Ă��̃��\�b�h���s�ɓ����Ă����̂�
 	 * @throws TraceFileException
 	 */
-	protected void calleeSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, Boolean isStatic, int index, IAliasCollector aliasCollector) {
+	protected void calleeSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, Boolean isStatic, int index, IAliasTracker aliasCollector) {
 		MethodExecution methodExecution = tracePoint.getMethodExecution();
 		Boolean isResolved = false;
 		String objectId = objList.get(index);		// calleeSearch() �ł͒ǐՑΏۂ̃I�u�W�F�N�g�͈�‚����A��objList��index�Ԗڂ̗v�f�ȊO�ύX���Ă͂����Ȃ�
@@ -801,7 +806,7 @@
 	 * @param aliasCollector �f���^���o���ɒǐՂ����I�u�W�F�N�g�̑S�G�C���A�X�����W���郊�X�i
 	 * @return ���o����
 	 */
-	public ExtractedStructure extract(Reference targetRef, TracePoint before, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(Reference targetRef, TracePoint before, IAliasTracker aliasCollector) {
 		TracePoint creationTracePoint;
 		if (targetRef.isArray()) {
 			// srcId �̔z��� dstId ���������Ă���”\�������郁�\�b�h���s���擾�i�z���p�̏����j
@@ -845,7 +850,7 @@
 	 * @param aliasCollector �f���^���o���ɒǐՂ����I�u�W�F�N�g�̑S�G�C���A�X�����W���郊�X�i
 	 * @return ���o����
 	 */
-	public ExtractedStructure extract(TracePoint creationTracePoint, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(TracePoint creationTracePoint, IAliasTracker aliasCollector) {
 		creationTracePoint = creationTracePoint.duplicate();
 		Statement statement = creationTracePoint.getStatement();
 		if (statement instanceof FieldUpdate) {
@@ -856,7 +861,7 @@
 		}
 	}
 
-	private ExtractedStructure extractSub(TracePoint creationTracePoint, Reference targetRef, IAliasCollector aliasCollector) {
+	private ExtractedStructure extractSub(TracePoint creationTracePoint, Reference targetRef, IAliasTracker aliasCollector) {
 		eStructure = new ExtractedStructure();
 		eStructure.setRelatedTracePoint(creationTracePoint.duplicate());
 		ArrayList<String> objList = new ArrayList<String>(); 
@@ -893,7 +898,7 @@
 	 * @param aliasCollector �f���^���o���ɒǐՂ����I�u�W�F�N�g�̑S�G�C���A�X�����W���郊�X�i
 	 * @return�@���o����
 	 */
-	public ExtractedStructure extract(MethodExecution calledMethodExecution, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(MethodExecution calledMethodExecution, IAliasTracker aliasCollector) {
 		ObjectReference callee = new ObjectReference(calledMethodExecution.getThisObjId(), calledMethodExecution.getThisClassName());
 		return extract(calledMethodExecution.getCallerTracePoint(), callee, aliasCollector);
 	}
@@ -915,7 +920,7 @@
 	 * @param aliasCollector �f���^���o���ɒǐՂ����I�u�W�F�N�g�̑S�G�C���A�X�����W���郊�X�i
 	 * @return ���o����
 	 */
-	public ExtractedStructure extract(TracePoint thisTracePoint, ObjectReference anotherObj, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(TracePoint thisTracePoint, ObjectReference anotherObj, IAliasTracker aliasCollector) {
 		eStructure = new ExtractedStructure();
 		eStructure.setRelatedTracePoint(thisTracePoint.duplicate());
 		MethodExecution methodExecution = thisTracePoint.getMethodExecution();
@@ -935,7 +940,7 @@
 		return extractSub2(thisTracePoint, objList, aliasCollector);
 	}
 	
-	private ExtractedStructure extractSub2(TracePoint tracePoint, ArrayList<String> objList, IAliasCollector aliasCollector) {
+	private ExtractedStructure extractSub2(TracePoint tracePoint, ArrayList<String> objList, IAliasTracker aliasCollector) {
 		eStructure.setCreationMethodExecution(tracePoint.getMethodExecution());
 		MethodExecution coordinator = callerSearch(trace, tracePoint, objList, null, aliasCollector);
 		eStructure.setCoordinator(coordinator);
@@ -989,7 +994,7 @@
 	 * @param aliasCollector �f���^���o���ɒǐՂ����I�u�W�F�N�g�̑S�G�C���A�X�����W���郊�X�i
 	 * @return�@���o����
 	 */
-	public ExtractedStructure extract(Object srcObj, Object dstObj, TracePoint before, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(Object srcObj, Object dstObj, TracePoint before, IAliasTracker aliasCollector) {
 		Reference targetRef = new Reference(Integer.toString(System.identityHashCode(srcObj)), Integer.toString(System.identityHashCode(dstObj)), null, null);
 		return extract(targetRef, before, aliasCollector);
 	}
@@ -1010,7 +1015,7 @@
 	 * @param arg ��������ɂ���Q�Ɛ�I�u�W�F�N�g(���[�J���ϐ�������ɂ��Q�Ɛ�)
 	 * @return ���o����
 	 */
-	public ExtractedStructure extract(TracePoint tracePoint, Object arg, IAliasCollector aliasCollector) {
+	public ExtractedStructure extract(TracePoint tracePoint, Object arg, IAliasTracker aliasCollector) {
 		ObjectReference argObj = new ObjectReference(Integer.toString(System.identityHashCode(arg)));
 		return extract(tracePoint, argObj, aliasCollector);
 	}