input unit with each other in accordance with a predetermined rule application_number US 2158098 A description a description will be given with reference to fig1 of the principle of an image data merging system according to an embodiment of the present invention referring to fig1 the image data merging system has an original information input unit 1 an identification information input unit 2 an image information merging unit 3 and an image information reproducing unit 4 the original information input unit 1 inputs original information and temporarily stores it as image information the identification information input unit 2 inputs identification information and temporarily stores it as image information the image information merging unit 3 merges the original information and the identification information both of which are stored as image information so that composite image information is formed the image information reproducing unit 4 records the composite image information in a medium a description will now given of an embodiment of the present invention in the embodiment the image data merging system is formed in a general purpose computer such as a personal computer or a workstation the image data merging system is embodied by a computer program executed by a computer system having a processing unit a main storage unit an auxiliary storage unit and an input output unit the computer program is supplied to the computer system using portable media such as floppy disks or cd roms or from a main storage unit or an auxiliary storage.