The simulation regarding the state change of the subject in a real spaceprovidesa system which represents impacts to three-dimensional computer graphicscaused bychanges of state of three-dimensional computer graphics composed and fixed tosubject, and state of image taking space by simulation, surface polygon modelandsimilar surface polygon model 1 is selected, according to shape pattern, fromsurfacepolygon model 2 measures, in a three-dimensional way, subject image existingin thesame space, a tracking process is performed on the computer graphics,following tothe relative position change of the position changes of the subject and thecameracaused in real three-dimensional space, subjects in the visual field of thecamera andvirtual three-dimensional computer graphics image is unified and displayed bydisplaying computer graphics image having the same relative position change ontheimage.
