Internet addicts

I think the general term is "net addict" or "cyber addict". You could also add "-phile" (='lover') and you'd be understood: net-phile, cyberphile.

We usually call him a "网虫"，meaning people who have the addiction to the cyber world .

(Some) People are addicted to living in a cyber or virtual world. Sorry, I didn't really get what the question was.