A game image representing an infield as a specific game image in a game space of a baseball game is displayed on a display surface of a monitor 5 as a reference game image. According to the position of a game medium character, for example, representing a baseball which serves as a game situation, the display of the reference game is switched to that of a combined game image. For example, if the ball flies in a direction toward an outfield (outfield direction), the outfield neighboring a partial game image displayed in the half of the display surface in the outfield direction within the reference game image is displayed as an adjacent game image instead of the partial game image. Accordingly, a game situation and a game progress can be easily grasped and a game operation can be more smoothly performed.