A game system displays an operation instruction sign corresponding to each piece of operation timing and an operation reference sign corresponding to current time in a time ordering array along a route in one of operation guide domains, generates a relative displacement according to a time progress of the game such that the operation instruction sign is matched with the operation reference sign in the operation timing, and switches the route in which the relative displacement is generated between the operation guide domains according to a predetermined condition. Also, the game system includes sequence data having operation timing corresponding to one of the operation guide domains and operation timing corresponding commonly to the operation guide domains. And, the game system controls display of the operation instruction sign corresponding to each piece of operation timing such that continuity of the relative displacement is maintained before and after switching of the route.