Disclosed is a game system capable of introducing a distinctive feature into each of a processing of designating offensive and defensive locations and a processing of determining a competition result so as to provide a game having a high level of playability. The game system comprises a plurality of game apparatuses each equipped with a touch panel 10 and a monitor 3, and connected to each other via a network. Each of the game apparatuses includes an image display control section 302 adapted to display a strike zone image (SZ image) on the monitor 3, and a setup section 304 adapted, based on manipulation information accepted from the touch panel 10, to set up a pitch location (or swing location) within the SZ image, and set up a shape of a first mark image on the basis of the setup location. The image display control section 302 is also adapted to display the first mark image on the SZ image in a superimposed manner, and, after completion of the setup processing by the setup section 304, display, onto the SZ image, a second mark image for the swing location (or pitch location) which is received from an opponent's game apparatus. The game apparatus further includes a batting result-setting section 307 adapted to set a batting result depending on a degree of overlapping between the first and second mark images.