To enable a player to easily and surely understand information provided by a performance in a game.

By retrieving a performance image and performance explanation relating to the performance corresponding to a retrieval condition from a storage part storing the respective performance images and performance explanations relating to the plurality of performances executed in the game and displaying the obtained performance image and performance explanation at a display device, a desired performance requested by the player is easily selected and executed and the meaning and expectation degree of the performance are provided to the player.