To improve a player's desire to play a game by giving the player a sufficient feeling of participation in changes in operation contents of a game machine.

Information on the jackpot frequency or the like of the game machine 1 is transmitted to a cellphone 3 from the game machine 1, and the information is transmitted to a management server 7 from the cellphone 3 through the Internet 5. The management server 7 processes game information and transmits a password to the cellphone 3 through the Internet 5 when the processed result fulfills predetermined conditions. The player starts a game, and transmits the password to the game machine 1 when reaching a ready-to-win state. In conjunction with this, rendering contents of the game machine 1 are changed. The password is transmitted in the ready-to-win state where player's consciousness is lifted, and since the rendering contents of the game machine 1 are changed in conjunction with this, the player can be given a strong impression of participation in the changes in the rendering contents.