To enable a large-scale game evolution in a game by which game value is exchanged between an owner and players and to provide a new pleasure of game to the participants of the game by adding new game elements.

When users wish to participate in a roulette game performed in a site run by a Web server 1, they apply for participation by using user terminals 10. One of the users who has declared himself as the owner can play as the owner of the roulette game. The users participating as players make predictions about numbers determined by the roulette and the like and bet chips as in the case of a general roulette game. If there is no winning chip, the betted chips in the field are paid to the owner and if there are winning chips, the dividend is calculated and is paid to the winning player. When the amount of dividend is larger than the amount of betted chips, the owner pays the player from his own chips.