IMAGE GENERATION SYSTEM AND IMAGE GENERATION-PURPOSE PROGRAM

When a process of generating a displayed image to be displayed on a terminal (100) is performed only by use of a server (200), a communication speed at which a server-side image (displayed image) is transmitted from the server (200) to the terminal (100) is stored, as a history, into a communication history storage unit (30). When the performance of the process of generating the displayed image is distributed between the terminal (100) and the server (200), the data volume of the server-side image generated at the server (200) is adjusted on the basis of the history of the communication speed stored in the communication history storage unit (30). In this way, the communication time can be prevented from becoming long, and the latency time required at the terminal (100) for synchronizing the terminal-side image with the server-side image and performing an image combination thereof can be possibly shortened.