Abstract: One object is to provide a system that determines a fairer exchange rate than conventional systems, the determined exchange rate being used in exchange of game contents in virtual space such as games.

Abstract: One object is to provide a system that determines a fairer exchange rate than conventional systems, the determined exchange rate being used in exchange of game contents in virtual space such as games.

Abstract: One object is to provide a game system that can technically restrain real money trade. In accordance with one aspect, a game system according to an embodiment of the present invention is composed of: a trade rate information generating unit configured to generate trade rate information; a trade rate information presenting unit configured to present the trade rate information in the game being played by a third player; a trade condition updating request receiving unit configured to receive from the third player a first trade condition updating; a trade condition updating unit configured to update the first trade condition information so as to include the trade quantity and player identification information of the third player included in the first trade condition updating request.