PROBLEM TO BE SOLVED: To provide a technology for narrowing a used endoscope among a plurality of endoscopes by retrieval processing.SOLUTION: A picked-up image storage part 160 stores picked-up images. A model number correspondence relation storage part 150 stores a correspondence relation between device kind information for identifying the kind of an endoscope and imaging element kind information for identifying the kind of an imaging element. A scope information storage part 152 stores a correspondence relation between device information for identifying an endoscope and the device kind information for identifying the kind of the endoscope. An imaging element kind information acquisition part 140 acquires imaging element kind information added to an image stored in the picked-up image storage part 160. A retrieval processing part 100 specifies one or more imaging devices on the basis of an acquisition result in the imaging element kind information acquisition part 140 with reference to the correspondence relation stored in the model number correspondence relation storage part 150 and the correspondence relation stored in the scope information storage part 152.SELECTED DRAWING: Figure 2
