Media data, which includes an image file recorded on a disk recording medium of a connected image sensing apparatus, management information including the recording position of the image file on the disk recording medium, and backup information of the management information, is received from the image sensing apparatus. Finalize processing of the disk recording medium is virtually executed using the received media data, and a generated disk image is stored on a memory. In response to a request from a data receiving terminal, the media data of the virtual disk image on the memory is transmitted to the data receiving terminal via a communication unit.