[Problem] To provide an effective advertising space in a free viewpoint moving picture. [Solution] A distribution computer 51 distributes free viewpoint moving picture data to each of user terminals 50AN1-50ANK. Each of the user terminals 50AN1-50ANK generates and displays a moving picture from the received free viewpoint moving picture data. Each of the user terminals 50AN1-50ANK extracts history data on a region of interest in the displayed picture and transmits the history data to a three-dimensional advertising space determination computer 52. The three-dimensional advertising space determination computer 52 stores the history data with respect to each user ID and each content ID, extracts a common region for each content ID from the regions of interest of the multiple users, and determines this region as being a three-dimensional advertising space therefor.
