It would be helpful for users using the internet to search for a property to be able to view a 360?celestial sphere panoramic image, rather than an image of only a portion of a photographic subject, when the photographic subject is a real estate property or the like. Therefore, a business entity (a management entity B) providing property information to users should provide celestial sphere panoramic images to a user (a user B) searching for a property. However, the user' s PC does not always have an application for viewing celestial sphere panoramic images installed. Therefore, when a communication terminal 3b of the user B requests celestial sphere panoramic image data, this image management system 5 transmits to the communication terminal 3b a celestial sphere panoramic image viewing script in addition to the image data (S9).