In a game server wherein a player can play a game online by operating a game terminal, and game program has two or more partial scenarios and the partial scenario has an event to be played by forming a party through two or more players, a unifier that unifies and controls scenario proceeding of the player as a challenger, a controller that controls to prohibit the unified player from executing another events, a processor that does a procedure corresponding to clearing on the player as the challenger to whom clearing of the event was judged, and a releaser that releases unification of the player classified into the challenger are provided.