A game processing server apparatus, to which plural terminal devices each being operated by a player are connected via a network, configured to provide a game service to the plural terminal devices, includes a player management unit which manages an association of a target player with other of the plural players; and an event management unit which controls a generation of an event for the target player based on a winning probability parameter of the target player indicating a probability of the target player winning the game determined based on player information of the target player and the players associated with the target player.