In a game play phase 210, a content server determines, as a timing for presenting a trophy, a time at which the status of the display world corresponding to the user operations has met a predetermined condition (S10). The content server collects training images indicating the scene being displayed at this point (S12), and generates 3D scene information 220 through machine learning (S14). In a trophy appreciation phase 212, in response to a request from the user, the content server generates and outputs a display image representing the trophy viewed from a given viewpoint, using the 3D scene information 220 (S16). The content server also receives an order placed for fabrication of a physical object corresponding to the trophy (S18).