An image processing system for electronizinq paper documents can read a large quantity of manuscripts with image processing apparatuses to generate images. The system has multi function peripherals (MFP). One of the MFPs (combination destination) can send a management table for managing image data to another MFP (transmission source), which designates an image data combination position, generates a management table for managing the image data of the transmission source MFP, generates a management table, in which the management table of the transmission source is added to the management table of the combination destination, and transfers the image data of the transmission source MFP and the management tables to the combination destination MFP, which combines the image data of the transmission source MFP and the image data of the combination destination MFP based on the management tables and the combination position.