When a plurality of players play a simulation game in a plurality of user stations connected to a single game management station via a network, each player is not restrained in a game space over a lengthy period of game time while maintaining the reflection of a strategic intention of each player on the progress of a game. A process for player character selection enables the strategic character selection reserved at a suitable point of time by player character selection reservation system to be the effective selection only at a point of character encountering time appearing every fixed period of time. A player character encountering event decision system enables the strategic search route setting reserved at a suitable point of time by a player character encountering event reservation system to be the effective setting only at a point of character encountering time appearing every fixed period of time.