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
new file mode 100644
index 0000000..4ffeaff
--- /dev/null
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
@@ -0,0 +1,173 @@
+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
+ *
+ */
+public class Alias {
+	private String objectId;
+	private TracePoint occurrencePoint; // ���Y�I�u�W�F�N�g�̎Q�Ƃ��s���Ă�����s�ӏ��ɑΉ�����TracePoint
+	/**
+	 * ���Y�I�u�W�F�N�g�̎Q�Ƃ�TracePoint�ɂ����Ăǂ��Ɍ���Ă��邩��\��<br>
+	 * 0				�t�B�[���h�A�N�Z�X���̃R���e�i �������� ���\�b�h�Ăяo�����̃��V�[�o<br>
+	 * 1, 2, 3 �c�c n		�t�B�[���h�A�N�Z�X���̃t�B�[���h(1) �������� ���\�b�h�Ăяo������n�Ԗڂ̎�����  (1���珇�Ԃ�)<br>
+	 * -1				���\�b�h�Ăяo�����̖߂�l<br>
+	 * <br>
+	 * ��1: d = a.m(b, c);<br>
+	 * <br>
+	 * ��1�̎��s���ɂ�����, a�̓��\�b�h�Ăяo���̃��V�[�o�Ȃ̂�0, b�̓��\�b�h�Ăяo����1�Ԗڂ̎������Ȃ̂�1,<br>
+	 * c�̓��\�b�h�Ăяo����2�Ԗڂ̎������Ȃ̂�2, a.m(b, c)�̖߂�l��-1 �ƂȂ�.<br>
+	 * <br>
+	 * ��2: d = a.f;<br>
+	 * ��2�̎��s���ɂ�����, a�̓t�B�[���h�̃R���e�i�Ȃ̂�0, b�̓t�B�[���h�Ȃ̂�1 �ƂȂ�.
+	 * 
+	 */
+	private int occurrenceExp;
+	public static final int OCCURRENCE_EXP_CONTAINER = 0;
+	public static final int OCCURRENCE_EXP_RECEIVER = 0;
+	public static final int OCCURRENCE_EXP_FIELD = 1;
+	public static final int OCCURRENCE_EXP_ARRAY = 1;
+	public static final int OCCURRENCE_EXP_FIRST_ARG = 1;
+	public static final int OCCURRENCE_EXP_RETURN = -1;
+	
+	
+	public Alias(String objectId, TracePoint occurrencePoint, int occurrenceExp) {
+		this.objectId = objectId;
+		this.occurrencePoint = occurrencePoint;
+		this.occurrenceExp = occurrenceExp;
+	}
+	
+	public String getObjectId() {
+		return objectId;
+	}
+
+	public TracePoint getOccurrencePoint() {
+		return occurrencePoint;
+	}
+
+	public int getOccurrenceExp() {
+		return occurrenceExp;
+	}
+	
+	public MethodExecution getMethodExecution() {
+		return occurrencePoint.getMethodExecution();
+	}
+
+	public String getMethodSignature() {
+		return occurrencePoint.getMethodExecution().getCallerSideSignature();
+	}
+	
+	public int getLineNo() {
+		Statement statement = occurrencePoint.getStatement();
+		return statement.getLineNo();
+	}
+
+	public String getStatementType() {
+		Statement statement = occurrencePoint.getStatement();
+		String statementType = "";
+		if (statement instanceof FieldAccess) {
+			FieldAccess fa = (FieldAccess)statement;
+			statementType = "FieldAccess";
+		} else if (statement instanceof FieldUpdate) {
+			FieldUpdate fu = (FieldUpdate)statement;
+			statementType = "FieldUpdate";
+		} else if (statement instanceof ArrayAccess) {
+			ArrayAccess aa = (ArrayAccess)statement;
+			statementType = "ArrayAccess";
+		} else if (statement instanceof ArrayUpdate) {
+			ArrayUpdate au = (ArrayUpdate)statement;
+			statementType = "ArrayUpdate";
+		} else if (statement instanceof ArrayCreate) {
+			ArrayCreate ac = (ArrayCreate)statement;
+			statementType = "ArrayCreate";
+		} else if (statement instanceof MethodInvocation) {
+			MethodExecution me = ((MethodInvocation)statement).getCalledMethodExecution();
+			statementType = "MethodInvocation";
+		}
+		return statementType;
+	}
+	
+	public String getStatementSignature() {
+		Statement statement = occurrencePoint.getStatement();
+		String statementSignature = "";
+		if (statement instanceof FieldAccess) {
+			FieldAccess fa = (FieldAccess)statement;
+			statementSignature = fa.getFieldName();
+		} else if (statement instanceof FieldUpdate) {
+			FieldUpdate fu = (FieldUpdate)statement;
+			statementSignature = fu.getFieldName();
+		} else if (statement instanceof ArrayAccess) {
+			ArrayAccess aa = (ArrayAccess)statement;
+			statementSignature = aa.getArrayClassName() + "[" + aa.getIndex() + "]";
+		} else if (statement instanceof ArrayUpdate) {
+			ArrayUpdate au = (ArrayUpdate)statement;
+			statementSignature = au.getArrayClassName() + "[" + au.getIndex() + "]";
+		} else if (statement instanceof ArrayCreate) {
+			ArrayCreate ac = (ArrayCreate)statement;
+			statementSignature = ac.getArrayClassName();
+		} else if (statement instanceof MethodInvocation) {
+			MethodExecution me = ((MethodInvocation)statement).getCalledMethodExecution();
+			statementSignature = me.getCallerSideSignature();
+		}
+		return statementSignature;		
+	}
+	
+	public String getClassName() {
+		Statement statement = occurrencePoint.getStatement();
+		String className = "";
+		if (statement instanceof FieldAccess) {
+			if (occurrenceExp == OCCURRENCE_EXP_CONTAINER) {
+				className = ((FieldAccess) statement).getContainerClassName();
+			} else if (occurrenceExp == OCCURRENCE_EXP_FIELD) {
+				className = ((FieldAccess) statement).getValueClassName();				
+			}
+		} else if (statement instanceof FieldUpdate) {
+			if (occurrenceExp == OCCURRENCE_EXP_CONTAINER) {
+				className = ((FieldUpdate) statement).getContainerClassName();
+			} else if (occurrenceExp == OCCURRENCE_EXP_FIELD) {
+				className = ((FieldUpdate) statement).getValueClassName();				
+			}
+		} else if (statement instanceof ArrayAccess) {
+			className = ((ArrayAccess) statement).getValueClassName();
+		} else if (statement instanceof ArrayUpdate) {
+			className = ((ArrayUpdate) statement).getValueClassName();
+		} else if (statement instanceof ArrayCreate) {
+			className = ((ArrayCreate) statement).getArrayClassName();
+		} else if (statement instanceof MethodInvocation) {
+			MethodExecution me = ((MethodInvocation)statement).getCalledMethodExecution();
+			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();	
+				}
+			}
+		}
+		return className;
+	}
+
+	@Override
+	public String toString() {
+		Statement statement = occurrencePoint.getStatement();
+		String className = getClassName();
+		String methodSignature = getMethodSignature();
+		String statementType = getStatementType();
+		String statementSigunarure = getStatementSignature();
+		String indent = "  ";
+		StringBuilder str = new StringBuilder();
+		str.append("objId: " + objectId + " (class = " + className + ")" + "\n");
+		str.append("tp: " + occurrencePoint + "\n");
+		str.append(indent + "signature: " + methodSignature + "\n");
+		str.append(indent + "lineNo: " + statement.getLineNo() + "\n");
+		str.append(indent + "statementType: " + statementType + " -> " + statementSigunarure + "\n");
+		str.append("occurrenceExp: " + occurrenceExp + "\n");
+		return str.toString();
+	}
+}