diff --git a/NewsForm.cs b/NewsForm.cs
index 28164a3..3e48a46 100644
--- a/NewsForm.cs
+++ b/NewsForm.cs
@@ -79,24 +79,17 @@ namespace NewsCrawler
 		int m_iCrawlInterval = 500;
 		bool m_bBuy = false;
 
-		List<string> m_URLs = new List<string>();
+		ConcurrentQueue<ListViewItem> m_NewItems = new ConcurrentQueue<ListViewItem>();
+		ConcurrentBag<string> m_URLs = new ConcurrentBag<string>();
 
 		System.Timers.Timer m_SystemTimer = new System.Timers.Timer();
 
 		ConcurrentQueue<PRICE_CHECK_DATA> m_PriceCheckList = new ConcurrentQueue<PRICE_CHECK_DATA>();
 		System.Timers.Timer m_PriceCheckTimer = new System.Timers.Timer();
 
-		delegate void InsertListView(string strTitle, string strName, string strCode, DateTime time, DateTime ResTime, string strURL, string strRef, double responseT, bool bInitial);
-		InsertListView m_InsertListViewDelegate = null;
-
 		Crawler m_Crawler = null;
-
 		ExcelHandler m_Excel = null;
 
-		object m_lvListLock = new object();
-
-		
-
 
 		public NewsForm()
 		{
@@ -116,8 +109,6 @@ namespace NewsCrawler
 
 			//MessageBox.Show("Keywords : \n\n" + m_Condition.GetKeywordsCnt());
 
-			m_InsertListViewDelegate = new InsertListView(this.InsertItem);
-
 			m_Crawler.ReadKIND(true);
 			m_Crawler.ReadDart(true);
 			m_Crawler.ReadEtoday(true);
@@ -532,30 +523,21 @@ namespace NewsCrawler
 			if(strURL == "")
 				return false;
 
-			lock(m_URLs)
-				return m_URLs.Any(s => s == strURL);
+			return m_URLs.Any(s => s == strURL);
 		}
 
 		public void InsertItem(string strTitle, string strName, string strCode, DateTime time, DateTime ResTime, string strURL, string strRef, double dElapseT, bool bInitial)
 		{
-			try
-			{
-				if(this.InvokeRequired)
-				{
-					this.Invoke(m_InsertListViewDelegate, strTitle, strName, strCode, time, ResTime, strURL, strRef, dElapseT, bInitial);
-				}
-				else
-				{
-					if(IsDuplicatedURL(strURL) == true)
-						return;
+			if (IsDuplicatedURL(strURL) == true)
+				return;
 
-					int iID = lvList.Items.Count+1;
+			int iID = lvList.Items.Count + 1;
 
-					CodeList.CODE_VALUE Code = m_CodeList.SearchCode(strTitle);
-					if(bInitial == false && Code != null)
-						ProcessSearchAndBuy(new NEWS_ITEM(iID, strTitle, strCode, Code, time, ResTime, strRef, strURL, (float)dElapseT));						
+			CodeList.CODE_VALUE Code = m_CodeList.SearchCode(strTitle);
+			if (bInitial == false && Code != null)
+				ProcessSearchAndBuy(new NEWS_ITEM(iID, strTitle, strCode, Code, time, ResTime, strRef, strURL, (float)dElapseT));
 
-					var AddedItem = lvList.Items.Add(new ListViewItem(new string[] {
+			var newItem = new ListViewItem(new string[] {
 						iID.ToString(),
 						time.ToString("HH:mm:ss"),
 						ResTime.ToString("HH:mm:ss:fff"),
@@ -568,31 +550,42 @@ namespace NewsCrawler
 						"",
 						"",
 						"",
-						strURL }));
+						strURL });
+			newItem.UseItemStyleForSubItems = false;
+			if (Code == null && strCode != "")
+				newItem.SubItems[chCodeName.Index].BackColor = Color.Gray;
 
-					AddedItem.UseItemStyleForSubItems = false;
-					if(Code == null && strCode != "")
-						AddedItem.SubItems[chCodeName.Index].BackColor = Color.Gray;
+			m_NewItems.Enqueue(newItem);
+			m_URLs.Add(strURL);
 
-					if(lvList.Items.Count < 2)
+			Action insert = delegate
+			{
+				if (m_NewItems.IsEmpty == false)
+				{
+					List<ListViewItem> itemList = new List<ListViewItem>();
+					ListViewItem item;
+					while (m_NewItems.TryDequeue(out item))
+						itemList.Add(item);
+
+					lvList.BeginUpdate();
+					lvList.Items.AddRange(itemList.ToArray());
+					if (lvList.Items.Count < 2)
 					{
-						foreach(ColumnHeader col in lvList.Columns)
+						foreach (ColumnHeader col in lvList.Columns)
 							col.Width = -2;
 					}
 
-					lock(m_URLs)
-						m_URLs.Add(strURL);
-
-					if(bInitial == false)
+					if (bInitial == false)
 						lvList.Sort();
-				}
-			}
-			catch(Exception ex)
-			{
-				Util.Log(Util.LOG_TYPE.ERROR, ex.Message + Environment.NewLine + ex.StackTrace);
-			}
-		}
+					lvList.EndUpdate();
+				}	
+			};
 
+			if (lvList.InvokeRequired)
+				lvList.Invoke(insert);
+			else
+				insert();
+		}
 
 		private void SystemTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
 		{
@@ -639,6 +632,9 @@ namespace NewsCrawler
 
 		private void UpdateStartPrice(int iID, int iPrice)
 		{
+			if (iID < 0)
+				return;
+
 			if(lvList.InvokeRequired)
 			{
 				lvList.BeginInvoke((MethodInvoker)delegate ()
@@ -774,9 +770,11 @@ namespace NewsCrawler
 		{
 			SortOrder Order = (lvList.Sorting == SortOrder.Descending || lvList.Sorting == SortOrder.None) ? SortOrder.Ascending : SortOrder.Descending;
 
+			lvList.BeginUpdate();
 			lvList.ListViewItemSorter = new ListViewItemComparer(e.Column, Order);
 			lvList.Sorting = Order;
 			lvList.Sort();
+			lvList.EndUpdate();
 		}
 
 		private void lvList_DoubleClick(object sender, EventArgs e)
@@ -1033,7 +1031,10 @@ namespace NewsCrawler
 			if(double.TryParse(item1.SubItems[m_iColumn].Text, out num1) && 
 				double.TryParse(item2.SubItems[m_iColumn].Text, out num2))
 			{
-				return (num1>num2)?1:-1;
+				if (m_Order == SortOrder.Ascending)
+					return (num1 > num2) ? 1 : -1;
+				else
+					return (num1 > num2) ? -1 : 1;
 			}
 			else
 			{
diff --git a/Program.cs b/Program.cs
index 0a6b81a..12faaac 100644
--- a/Program.cs
+++ b/Program.cs
@@ -14,16 +14,16 @@ namespace NewsCrawler
 		[STAThread]
 		static void Main()
 		{
-			//try
-			//{
+			try
+			{
 				Application.EnableVisualStyles();
 				Application.SetCompatibleTextRenderingDefault(false);
 				Application.Run(new NewsForm());
-			//}
-			//catch(Exception ex)
-			//{
-			//	Console.WriteLine(ex.Message + Environment.NewLine + ex.StackTrace);
-			//}
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine(ex.Message + Environment.NewLine + ex.StackTrace);
+			}
 		}
 	}
 }