A control unit of an image data management system receives image information and information regarding the image information, which are associated with each other, from an image photographing device via a communication unit, and stores the received information in a storage unit. The control unit receives an acquisition request for acquiring the image information and the information regarding the image information, which are associated with each other, from a terminal device via the communication unit, reads out the image information and the information regarding the image information, which are associated with each other and stored in the storage unit, in accordance with the acquisition request, and sends the read-out information to the terminal device which has sent the acquisition request via the communication unit.