An image processing system in which an image reading apparatus and an image formation apparatus are connected to each other through a communication interface, in which the image reading apparatus includes: a reading section that reads an original and generates image data, a memory that stores the image data, and a mount-processing permission section that, when the image reading apparatus is connected to the image formation apparatus through the communication interface, permits the image formation apparatus to carry out a mount-processing of the memory; the image formation apparatus includes: a mount-processing section that, when the image formation apparatus is connected to the image reading apparatus through the communication interface and permitted to carry out the mount-processing of the memory, carries out the mount-processing of the memory; and the image formation apparatus stores image data received from another communication interface into the memory for which the mount-processing has been carried out.