An image verification system includes an image input apparatus, image verification apparatus, and database apparatus. The image input apparatus generates verification information for image data by using a private key and adds the verification information and predetermined information unique to the image input apparatus to the image data. The image verification apparatus verifies that the image data has been altered or not by using the verification information and a public key corresponding to the private key. The database apparatus stores the public key in association with the predetermined information in the a storage unit and provides the public key to the image verification apparatus.