Harnan,
Physically connecting your MCU can be done in two different ways. The easiest way of doing it is via you serial port. This puts limits on your transmission speed. A little more complicated (but not to hard) is to use an ethernet controller and hooking your MCU up to a LAN. I think there's a schematic on the Invector (www.invector.nu) site on how to connect a CS8900A chip to the 8052. If you have a LAN/WAN gateway your MCU can talk over the internet that way.

Having said that you must realise that the hardware is not the complicated issue, the software is. Or rather the TCP/IP stack is. I recommend that you download a freeware stack and read the documentation and take it from there. I have used the UiP (http://dunkels.com/adam/uip) stack in a few projects and it works very well and is throroughly documented.

Good luck with you efforts,
Dan the man