IP camera interface with arduino

please am new to arduino, how do i interface a camera to an arduino mega.

If your searches fail to find any results then there are three possible reasons:

1) Incorrect search terms.

2) Nobody has done it yet.

3) It can't be done (within reason).

You don't provide any detail of what you mean by 'interface', so in this case I would go with 3), although I'm more than happy to be proved wrong.