To execute a performance without the feeling of incompatibility using a performance button during a continuous notice performance.

A performance control part 202 includes a continuous notice performance part 611, a reception part 612, a setting part 613, and an operation performance part 614. The continuous notice performance part 611 executes a series of continuous notice performances over two or more times of the variation performance of performance symbols corresponding to two or more times of the variation of special symbols using a determination result determined by a prior determination part 602 of a main control part 201. The reception part 612 receives operation input from a player through a performance button. The setting part 613 sets the number of times of validating operations for validating a button performance when the operation input is received by the reception part 612 for each variation performance on the basis of the variation time of one variation of the special symbols at the start of the respective variation performances when the continuous notice performance is performed by the continuous notice performance part 611. The operation performance part 614 executes the performance on the basis of the number of times of validating operations set by the setting part 613.