A player participating in a network game moves a player character of the player by manipulating a video game apparatus of the player. As the player performs an autopilot operation, the video game apparatus moves the player character as an autopilot PC. A server apparatus manages the game which progresses according to the movement of each character, and transmits progress information of the game to the video game apparatus of each player participating in the network game. The movement of the autopilot PC is decided based on an action log recording the action of the player character responding to the manipulation of the player.