To obtain a network copy file management system, which stores image data obtained by reading an original as an image file on a disk in a copy system and also can transmit the image file to a 3rd network device.

Image data, obtained by a scanner part 115, is stored in an image file and stored in a hard disk (13), whereas each client terminal 2 requests a copy server 10 for the management information of the image file in the hard disk (13). A control part 112 of the server 10, receiving this file management information request, reads file management information about the image file in a request object directory from the disk (13) and transmits it to the client terminal of a request source. The image file is transmitted to a 3rd network device in accordance with operation performed by an operator, on the basis of the information.