A game server includes: a multiplayer play request acknowledging unit operative to acknowledge, from a game device of a player, a request for a multiplayer play where a game is played between a game device of a requesting player and a game device of another player; a selection unit operative to select a first mode or a second mode of multiplayer play, the first mode being a mode where a multiplayer play is played with a player accepting the request for a multiplayer play, and the second mode being a mode where a selected player is forced to play in a multiplayer play; a friendly mode matching unit and a hostile mode matching unit operative to refer to a player database storing information on players and select a player to play the requested multiplayer play; and a requesting unit operative to notify the selected player's game device of the selected mode and requests the game device thus notified to start the requested multiplayer play.