Provided is an image processing system which reduces the load of destination registration on the user. To accomplish this, in an image processing system including a PC (102) and device (101) connected to a network, the PC (102) has a transfer unit (120) which transfers identification data of the PC (102) to the device (101), and the device (101) has a scanner unit (130) which scans an image and outputs the image data, a memory (140) which stores a destination of the output image data from the scanner unit (130), a transfer unit (150) which transfers the image data to the destination stored in the memory (140), and a registration unit (170) which receives the identification data transferred by the transfer unit (120), and registers the received identification data as a destination of image data in the memory (140).