An image management system for managing image data obtained by the visitors to a theme park or similar facilities with their own imaging devices in the same manner as the image data obtained by the cameras installed in the facility. The subject user is photographed by the photographing system installed in the theme park to obtain first image data. At the same time, the user ID is obtained from the wireless tag carried by the subject user, which is related to the first image data and stored in the image storage server with the first image data. A second image data obtained by the subject user with a digital camera are also stored in the image storage server with the user ID being related to the second image data. The first and second image data are sorted and stored by each of the user IDs.