Game advertising system

A game advertising system for advertising, in a game that a plurality of players connected via a network play together, by attaching a mark to characters operated by each of the players, the game advertising system comprising:

• an enterprise-side input unit that allows input by a plurality of enterprises that wish a mark thereof to be attached to a character;
• a player-side input unit that allows selecting a mark to be attached to the character that players each operate from among the marks of the plurality of enterprises;
• an advertising-cost charging unit that charges, if the mark selected by each of the players is attached to the character, an advertising fee to the enterprise corresponding to the selected mark;
• and
• a benefit awarding unit that awards a predetermined benefit if each of the players attaches the mark to the character.