diff --git a/src/org/ntlab/traceDebugger/BreakPointView.java b/src/org/ntlab/traceDebugger/BreakPointView.java
index a7729c0..fff2771 100644
--- a/src/org/ntlab/traceDebugger/BreakPointView.java
+++ b/src/org/ntlab/traceDebugger/BreakPointView.java
@@ -1,5 +1,7 @@
 package org.ntlab.traceDebugger;
 
+import java.util.ArrayList;
+
 import org.eclipse.debug.internal.ui.IInternalDebugUIConstants;
 import org.eclipse.debug.ui.DebugUITools;
 import org.eclipse.debug.ui.IDebugUIConstants;
@@ -16,6 +18,7 @@
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.TableViewer;
+import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Menu;
@@ -96,6 +99,10 @@
 		TraceDebuggerPlugin.setActiveView(ID, this);
 	}
 
+	public Viewer getViewer() {
+		return viewer;
+	}
+	
 	@Override
 	public void setFocus() {
 		// TODO Auto-generated method stub
@@ -267,6 +274,11 @@
 		viewer.getControl().setMenu(menu);
 		getSite().registerContextMenu(menuMgr, viewer);
 	}
+
+	public void reset() {
+		viewer.setInput(new ArrayList<TraceBreakPoint>());
+		viewer.refresh();
+	}
 	
 	public void updateTraceBreakPoints(TraceBreakPoints traceBreakPoints) {
 		viewer.setInput(traceBreakPoints.getAllTraceBreakPoints());
diff --git a/src/org/ntlab/traceDebugger/DebuggingController.java b/src/org/ntlab/traceDebugger/DebuggingController.java
index ba0e2a8..612b717 100644
--- a/src/org/ntlab/traceDebugger/DebuggingController.java
+++ b/src/org/ntlab/traceDebugger/DebuggingController.java
@@ -10,12 +10,17 @@
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.jface.dialogs.InputDialog;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.FileDialog;
 import org.eclipse.swt.widgets.Shell;
 import org.ntlab.traceAnalysisPlatform.tracer.trace.ArrayUpdate;
@@ -34,9 +39,14 @@
 	private TraceBreakPoint selectedTraceBreakPoint;
 	private TraceBreakPoints traceBreakPoints;
 	private IMarker currentLineMarker;
+	private LoadingTraceFileStatus loadingTraceFileStatus = LoadingTraceFileStatus.NOT_YET;
 	private boolean isRunning = false;
 	public static final String CURRENT_MARKER_ID = "org.ntlab.traceDebugger.currentMarker";
 	
+	private enum LoadingTraceFileStatus {
+		NOT_YET, PROGRESS, DONE
+	}
+	
 	private DebuggingController() {
 		
 	}
@@ -62,6 +72,10 @@
 	}
 	
 	public boolean fileOpenAction(Shell shell) {
+		if (loadingTraceFileStatus == LoadingTraceFileStatus.PROGRESS) {
+			MessageDialog.openInformation(null, "Loading", "This debugger is loading the trace.");
+			return false;
+		}
 		if (isRunning) {
 			MessageDialog.openInformation(null, "Running", "This debugger is running on the trace.");
 			return false;
@@ -71,21 +85,54 @@
 		fileDialog.setFilterExtensions(new String[]{"*.*"});
 		String path = fileDialog.open();
 		if (path == null) return false;
-		TraceJSON trace = new TraceJSON(path);
-		TraceDebuggerPlugin.setAnalyzer(new DeltaExtractionAnalyzer(trace));
-		VariableUpdatePointFinder.getInstance().setTrace(trace);
-		traceBreakPoints = new TraceBreakPoints(trace);
+		
 		((CallStackView)TraceDebuggerPlugin.getActiveView(CallStackView.ID)).reset();
 		((VariableView)TraceDebuggerPlugin.getActiveView(VariableView.ID)).reset();
-		((BreakPointView)TraceDebuggerPlugin.getActiveView(BreakPointView.ID)).updateTraceBreakPoints(traceBreakPoints);
+		((BreakPointView)TraceDebuggerPlugin.getActiveView(BreakPointView.ID)).reset();
 		((TracePointsView)TraceDebuggerPlugin.getActiveView(TracePointsView.ID)).reset();
 		CallTreeView callTreeView = (CallTreeView)TraceDebuggerPlugin.getActiveView(CallTreeView.ID);
 		if (callTreeView != null) callTreeView.reset();
+		loadTraceFileOnOtherThread(path);
 		return true;
 	}
 	
+	private void loadTraceFileOnOtherThread(final String filePath) {
+		Job job = new Job("Loading Trace File") {
+			@Override
+			protected IStatus run(IProgressMonitor monitor) {							
+				monitor.beginTask("Loading Trace File" + " (" + filePath + ")", IProgressMonitor.UNKNOWN);
+				loadingTraceFileStatus = LoadingTraceFileStatus.PROGRESS;
+				TraceDebuggerPlugin.setAnalyzer(null);
+				TraceJSON trace = new TraceJSON(filePath);
+				TraceDebuggerPlugin.setAnalyzer(new DeltaExtractionAnalyzer(trace));
+				VariableUpdatePointFinder.getInstance().setTrace(trace);
+				traceBreakPoints = new TraceBreakPoints(trace);
+				
+				// GUI�̑����GUI�̃C�x���g�f�B�X�p�b�`���s���Ă���X���b�h���炵������ł��Ȃ��̂ł�������
+				final BreakPointView breakpointView = (BreakPointView)TraceDebuggerPlugin.getActiveView(BreakPointView.ID);
+				Control control = breakpointView.getViewer().getControl();
+				control.getDisplay().syncExec(new Runnable() {
+					@Override
+					public void run() {
+						breakpointView.updateTraceBreakPoints(traceBreakPoints);
+					}
+				});
+				monitor.done();
+				if (!(monitor.isCanceled())) {
+					loadingTraceFileStatus = LoadingTraceFileStatus.DONE;
+					return Status.OK_STATUS;
+				} else {
+					loadingTraceFileStatus = LoadingTraceFileStatus.NOT_YET;
+					return Status.CANCEL_STATUS;
+				}
+			}
+		};
+		job.setUser(true);
+		job.schedule();
+	}
+	
 	public boolean addTraceBreakPointAction() {
-		if (TraceDebuggerPlugin.getAnalyzer() == null) {
+		if (loadingTraceFileStatus != LoadingTraceFileStatus.DONE) {
 			MessageDialog.openInformation(null, "Error", "Trace file was not found");
 			return false;
 		}
@@ -105,7 +152,7 @@
 	}
 
 	public boolean impoerBreakpointAction() {
-		if (TraceDebuggerPlugin.getAnalyzer() == null) {
+		if (loadingTraceFileStatus != LoadingTraceFileStatus.DONE) {
 			MessageDialog.openInformation(null, "Error", "Trace file was not found");
 			return false;
 		}
@@ -129,11 +176,13 @@
 	}
 	
 	public boolean debugAction() {
-		if (TraceDebuggerPlugin.getAnalyzer() == null) {
+		if (loadingTraceFileStatus != LoadingTraceFileStatus.DONE) {
 			MessageDialog.openInformation(null, "Error", "Trace file was not found");
 			return false;
 		}
-		terminateAction();
+		if (isRunning) {
+			return false;
+		}
 		debuggingTp = traceBreakPoints.getFirstTracePoint();
 		if (debuggingTp == null) {
 			MessageDialog.openInformation(null, "Error", "An available breakpoint was not found");