A display displays a frame of image associated with a unit game, a counter to be reset under a prescribed condition increments a count value along with execution of the unit game, and a controller determines by an external input an upper limit of a number of bet pieces of monetary value as a condition for acquisition of an insurance pay in the unit game, pays out a prescribed number of pieces of monetary value for the play result of the unit game to be a special play result, accepts, within a range of the upper limit of the number of bet pieces, a bet of monetary value as the condition for acquisition of the insurance pay, and gives the insurance pay for the count value having reached a preset upper limit count value in the unit game having the bet of monetary value as the condition for acquisition of the insurance pay.