diff --git a/src/org/ntlab/deltaExtractor/DeltaExtractorJSON.java b/src/org/ntlab/deltaExtractor/DeltaExtractorJSON.java
index 940e0e5..693ed5e 100644
--- a/src/org/ntlab/deltaExtractor/DeltaExtractorJSON.java
+++ b/src/org/ntlab/deltaExtractor/DeltaExtractorJSON.java
@@ -626,8 +626,11 @@
 					if (objectId.equals(srcObject.getId())) {
 						r = new Reference(thisObj, srcObject);
 						r.setCollection(true);
-						if (methodExecution.getSignature().contains(".iterator()") ||
-								methodExecution.getSignature().contains(".listIterator()")) r.setCreation(true);		// �C�e���[�^�I�u�W�F�N�g�𐶐������Ƃ݂Ȃ�
+						if (methodExecution.getSignature().contains(".iterator()")
+								|| methodExecution.getSignature().contains(".listIterator()") 
+								|| methodExecution.getSignature().contains(".entrySet()")
+								|| methodExecution.getSignature().contains(".keySet()")
+								|| methodExecution.getSignature().contains(".values()")) r.setCreation(true);		// �C�e���[�^�I�u�W�F�N�g���𐶐������Ƃ݂Ȃ�
 						eStructure.addSrcSide(r);
 						srcObject = thisObj;
 						aliasCollector.changeTrackingObject(objectId, thisObjectId, true);
@@ -635,8 +638,11 @@
 					} else if(objectId.equals(dstObject.getId())) {
 						r = new Reference(thisObj, dstObject);
 						r.setCollection(true);
-						if (methodExecution.getSignature().contains(".iterator()") ||
-								methodExecution.getSignature().contains(".listIterator()")) r.setCreation(true);		// �C�e���[�^�I�u�W�F�N�g�𐶐������Ƃ݂Ȃ�
+						if (methodExecution.getSignature().contains(".iterator()")
+								|| methodExecution.getSignature().contains(".listIterator()")
+								|| methodExecution.getSignature().contains(".entrySet()")
+								|| methodExecution.getSignature().contains(".keySet()")
+								|| methodExecution.getSignature().contains(".values()")) r.setCreation(true);		// �C�e���[�^�I�u�W�F�N�g���𐶐������Ƃ݂Ȃ�
 						eStructure.addDstSide(r);
 						dstObject =thisObj;
 						aliasCollector.changeTrackingObject(objectId, thisObjectId, false);