A cooperative system comprises an image processing apparatus and a portable terminal; the image processing apparatus comprises: a display; a judgment portion judging whether an operation screen requested from the portable terminal apparatus is a first screen including a file area or a second screen including no file area; and a transmitter transmitting screen data for reproducing the first or second screen depending on the judgment result, along with a file and area reproduction information; the portable terminal comprises: a requestor requesting for the screen data; a reproducer reproducing the first or second screen; a display displaying the first or second screen; a judgment portion judging whether user operates on the file area or the other area; and a controller showing in the file area an appropriate portion of the file for user operation if user operates on the file area.