I am having Internet connection at one computer and I want to share the internet with other computers. Will that is possible the same connection is used with other 4 to 5 computers or at least one computer.

Yes.

As you haven't given us enough to go on try this: internet connection sharing - Google Search (http://www.google.co.uk/search?client=firefox-a&rls=org.mozilla%3Aen-GB%3Aofficial&channel=s&hl=en&q=internet+connection+sharing&meta=&btnG=Google+Search)

Right click on local area connection - properties- then click on internet sharing with other lan card
Enjoy the internet in all computers...

I think you can connect all your PC's to a mini switch that have enough ports. The switch should have a port that connects to the Internet that way you can share the connection amongst all PC's through the switch!