Had problem for displaying serial data on Tkinter Window.

This code is to receive serial data and print on the Tkinter window. This code is working fine for receiving single line of serial data and printing on the Tkinter window.When it receive serial data again, the displaying data will wipe out and newly received serial data will print on the Tkinter window.This should happen every time it receives serial data.But the problem is, if it receives multiple lines( for example: 5 lines) of serial data, it prints entire 5 lines of received serial data at first line on the Tkinter window, and just displays left over few characters on the Tkinter window.

IF any one had two pc's, please run the code in 1 pc, and receive serial data coming from other pc.
please help me out, breaking my head with this from few days, i hope some one will help me out, THANK YOU.

import serial
import threading
import Queue
import Tkinter as tk


class SerialThread(threading.Thread):
def __init__(self, queue):
threading.Thread.__init__(self)
self.queue = queue
def run(self):
s = serial.Serial('COM10',9600, timeout=10)
s.bytesize = serial.EIGHTBITS #number of bits per bytes
s.parity = serial.PARITY_NONE #set parity check: no parity
s.stopbits = serial.STOPBITS_ONE #number of stop bits

while True:
if s.inWaiting():
text = s.readline(s.inWaiting())
self.queue.put(text)

class App(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self.geometry("1360x750")
frameLabel = tk.Frame(self, padx=40, pady =40)
self.text = tk.Text(frameLabel, wrap='word', font='TimesNewRoman 37',
bg=self.cget('bg'), relief='flat')
frameLabel.pack()
self.text.pack()
self.queue = Queue.Queue()
thread = SerialThread(self.queue)
thread.start()
self.process_serial()

def process_serial(self):
self.text.delete(1.0, 'end')
while self.queue.qsize():
try:
self.text.insert('end', self.queue.get())
except Queue.Empty:
pass
self.after(100, self.process_serial)

app = App()
app.mainloop()