diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
index b1e6e11..54126ef 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
@@ -1,5 +1,7 @@
 package org.ntlab.traceCollector.tracer.trace;
 
+import java.util.ArrayList;
+
 /**
  * �I�u�W�F�N�g�̎Q�Ə��(�G�C���A�X)��\���N���X
  * @author Isitani
@@ -53,26 +55,43 @@
 	public String toString() {
 		StringBuilder str = new StringBuilder();
 		Statement statement = occurrencePoint.getStatement();
+		String className = "";
 		String statementType = "";
 		if (statement instanceof FieldAccess) {
 			statementType = "FieldAccess";
+			className = ((FieldAccess) statement).getValueClassName();
 		} else if (statement instanceof FieldUpdate) {
 			statementType = "FieldUpdate";
+			className = ((FieldUpdate) statement).getValueClassName();
 		} else if (statement instanceof ArrayAccess) {
 			statementType = "ArrayAccess";
+			className = ((ArrayAccess) statement).getValueClassName();
 		} else if (statement instanceof ArrayUpdate) {
 			statementType = "ArrayUpdate";
+			className = ((ArrayUpdate) statement).getValueClassName();
 		} else if (statement instanceof ArrayCreate) {
 			statementType = "ArrayCreate";
+			className = ((ArrayCreate) statement).getArrayClassName();
 		} else if (statement instanceof MethodInvocation) {
 			MethodExecution me = ((MethodInvocation)statement).getCalledMethodExecution();
 			statementType = "MethodInvocation -> " + me.getCallerSideSignature();
 			if(((MethodInvocation)statement).getCalledMethodExecution().isConstructor()) {
 				statementType += " (Constructor)";
 			}
+			if (occurrenceExp == OCCURRENCE_EXP_RETURN) {
+				className = me.getReturnValue().getActualType();
+			} else if (occurrenceExp == OCCURRENCE_EXP_RECEIVER) {
+				className = me.getThisClassName();
+			} else {
+				int index = occurrenceExp - OCCURRENCE_EXP_FIRST_ARG;
+				ArrayList<ObjectReference> args = me.getArguments();
+				if (index >= 0 && index < args.size()) {
+					className = me.getArguments().get(index).getActualType();	
+				}
+			}
 		}
 		String indent = "  ";
-		str.append("objId: " + objectId + "\n");
+		str.append("objId: " + objectId + " (class = " + className + ")" + "\n");
 		str.append("tp: " + occurrencePoint + "\n");
 		str.append(indent + "signature: " + occurrencePoint.getMethodExecution().getCallerSideSignature() + "\n");
 		str.append(indent + "lineNo: " + statement.getLineNo() + "\n");