diff --git a/src/org/ntlab/deltaViewer/CollaborationViewer.java b/src/org/ntlab/deltaViewer/CollaborationViewer.java
index c47b7e7..ed2b958 100644
--- a/src/org/ntlab/deltaViewer/CollaborationViewer.java
+++ b/src/org/ntlab/deltaViewer/CollaborationViewer.java
@@ -138,6 +138,32 @@
 		// Make ObjectEdge and reset position of vertexObject, remove vertexMethodExecution.
 		Statement statement = relatedPoint.getStatement();
 		MethodExecution prevMethodExec = prevAlias.getMethodExecution();
+		if (relatedPoint.isMethodEntry()) {
+			if (prevAlias.getAliasType() == Alias.AliasType.FORMAL_PARAMETER) {
+				// this to another (parameter)
+				MethodExecution calledMethodExec = relatedPoint.getMethodExecution();
+				String srcClassName = calledMethodExec.getThisClassName();
+				String srcObjId = calledMethodExec.getThisObjId();
+				String tgtObjId = prevAlias.getObjectId();
+				ObjectVertex tgtObjectVertex = objectToVertexMap.get(tgtObjId);
+
+				createObjectRefrence(srcClassName, srcObjId, tgtObjId);
+				if (methodExecToVertexMap.containsKey(prevMethodExec)) {
+					if (methodExecToVertexMap.get(prevMethodExec).getLocals().contains(tgtObjectVertex)) {
+						methodExecToVertexMap.get(prevMethodExec).getLocals().remove(tgtObjectVertex);
+						System.out.println(methodExecToVertexMap.get(prevMethodExec).getLabel() + " :removeLocal: " + tgtObjectVertex.getLabel());
+					} else if (methodExecToVertexMap.get(prevMethodExec).getArguments().contains(tgtObjectVertex)) {
+						methodExecToVertexMap.get(prevMethodExec).getArguments().remove(tgtObjectVertex);
+						System.out.println(methodExecToVertexMap.get(prevMethodExec).getLabel() + " :removeArgument: " + tgtObjectVertex.getLabel());
+					}
+				}
+				if (nextAlias == null || (nextAlias != null && !calledMethodExec.getSignature().equals(nextAlias.getMethodSignature()))) {
+					removeCalledMethodExecutionVertex(objectToVertexMap.get(srcObjId), prevMethodExec, calledMethodExec);
+					updateObjectVertices();
+				}
+				return;
+			}
+		}
 		if(statement instanceof FieldUpdate) {
 			// Format fieldName.
 			FieldUpdate fieldUpdateStatement = (FieldUpdate) statement;