This invention has as its object to reduce network traffic when a remote copy process is done using network devices. To achieve this object, a computer (13) acquires stub drivers (610, 612) from image input/output devices (12-1, 12-2) (S1601, S1602), and sends the stub driver (610) to the image input/output device (12-1) (S1605). The image input/output device (12-1) drives the image input/output device (12-2) by executing the received printer stub driver (610), sends scanned data, and makes the image input/output device (12-2) print the data.