I don't think he is asking about stealing cable, but rather using the same cable line for both his internet and TV.
If this is what you are asking, yes, both signals are on the same line. My wife and I subscribe to Basic Cable, and Cable internet. We don't need two cable lines from it, instead, the cable line is split at the wall (we actually got the panel installed for free from the company, but installing it yourself would be easy too), and one end of the split goes to the TV, the other to our cable modem.
So yes it is possible. If you are looking to just send the cable to another set which is not in reach of a wall jack, you can also buy low power transmitters to send the signal over RF, your local electronics store should carry these, but they are not worth the cost.