In the image data processing apparatus of the present invention, one or more job icons each of which is indicative of the presence of a received job are displayed in a screen of a touch panel, and when any one of the displayed job icons is operated, an information window disclosing detail information concerning the operated job icon is additionally displayed. As a result, a limited display area of the touch panel can be effectively utilized, so that this enables the user to easily find not only a processing status of the received job but also detail information of the job.