Device B requests a network service of device A, and devices B and A are set in a client mode and server mode, respectively. Further, a mode is set in which the console unit of device A is controlled from that of device B, and image data scanned and created by the scanner of device B is processed as image data scanned by that of device A. In response to process start designation input from the console unit of device B, device A designates device B to scan an image using the scanner of device B. In response to the designation, device B transmits image data scanned by the scanner of device B to device A. Device A executes a process corresponding to setting information for the image data.