To allow a player to recognize a level of possibility of turning off a probability variable mode.

When determining that the probability variable mode is not turned off, an image of a dog A coming in second is displayed with a high probability compared with an image of coming in third or lower, and when determining that the probability variable mode is turned off, the image of the dog A coming in second is displayed with a low probability compared with the image of coming in third or lower. The player can thereby recognize that the possibility of turning off the probability variable mode is low from the rank of the dog A being second and recognize that the possibility of turning off the probability variable mode is high compared with the case of holding the second place, from the rank of the dog A being the third or lower.