Now I am able to read data in serial monitor of Arduino IDE Environment. I would like to read data from web using Thingspeak. schematic diagram will be helpful
@settisuresh, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project 
See About the Installation & Troubleshooting category.
I'm not that familiar with the ESP8266. You can use one of the spare serial ports on the Mega and connect it to the ESP8266's serial port.
- A connection with the ESP8266's serial port might interfere with uploads to the ESP8266.
- The ESP8266 is a 3.3V device; you will need a voltage divider between the used Mega's TX and the ESP8266's RX.
Questions similar to this are on this forum often. A search of the forum should return much information.
What is the Mega doing? An ESP8266 is a very capable microcontroller on its own. One of the ESP8266 boards like a NodeMCU can probably do the job by itself. It would make things easier to do without the Mega.
I am using MLX90614 infrared temperature sensor and US100 ultrasonic sensor and Mercury M6e reader compatible with arduino Mega 2560.
I will try to compile the code on Node MCU, but if it doesn't support - only option is I have to integrate the NodeMCU with Mega board, so that I can read the data in web.
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