I wan to connect my computer to cable network please gide me

What is the actual problem you are having? Do you have a network setup? If so, you can use a typical CAT5/6 cable to plug into a switch port, or a jack on the wall that runs back to the network equipment.

You need at the least a cable modem (you can purchase these from Best Buy, Amazon.com, et al). You should probably also get an ethernet switch/router, which you connect the modem to with the ethernet port, and connect the modem via its coaxial connector to the cable. Finally, you will need to configure the modem (contact your cable provider for instructions) and the router.