Helping people with computers... one answer at a time.
Connecting two different internet connections is technically possible, but not easily and not likely to accomplish what you have in mind.
Is it possible combine 2 different internet connections from 2 different ISPs?
Technically, yes, anything's possible. :-). In reality though, this is usually left to the realm of high-end routers; there's no pre-packaged solution for multiple computers that I'm aware of. A single computer can sometimes make use of multiple connections which is similar to having two network cards.