Abstract: The following steps are executed: a step of randomly determining a payout by display area random determination; a step of displaying, on a lower image display panel 141, a voltage meter 250 which is divided into a plurality of display areas 251, 252, 253, and 254 and arranged to serially point the display areas 251, 252, 253, and 254 after a predetermined time elapses or in response to the input operation through the spin button 46 so as to increase the voltage of the meter; a step of serially pointing the display areas 251, 252, 253, and 254 of the voltage meter 250 after the predetermined time elapses or in response to the input operation through the spin button 46; and a step of awarding the payout determined in the display area random determination when a predetermined display area of the voltage meter 250 is pointed.