1. A game management server comprising; a game-holding-prior-notice-receiving unit operative to receive a prior notice of a multiplayer game being held and a request to call for entries to the multiplayer game from a terminal of a user who hosts the multiplayer game via a network; an entry-reservation-receiving unit operative to make the prior notice of the multiplayer game being held open via the network, and operative to receive an entry reservation for the multiplayer game from a terminal of a user who will participate in the multiplayer game; and a game management unit operative to manage the multiplayer game to be held, wherein the game-holding-prior-notice-receiving unit receives a date and time the multiplayer game is expected to be held, and the entry-reservation-receiving unit presents the date and time the multiplayer game is expected to be held and receives an entry reservation.