To easily form a new bowling game by deforming the traditional bowling game in various ways.

A game maker determines whether or not the if-then function has been selected (step S22) and, if it has been selected, executes the if-then function (S23), canceling the corresponding score, and outputting a control signal to a game setter so that bowling pins are newly set. Therefore a pin setter newly sets bowling pins. In this case, the count of the corresponding frame is canceled. If a predetermined number of ten-pin games has been done, a central control unit outputs a signal permitting the use of a bonus-turn function to the game maker of that lane via an MCD. The game maker determines whether or not the bonus turn function has been permitted (step S25) and, if the bonus turn function has been permitted, executes the bonus turn function (step S26).