Abstract: In a network game system, as well as causing a player to appreciate a growth of a character in accordance with an elapsing of time, to cause the player not to feel a strangeness either in a display of a character which another player is breeding. A visible range of a hypothetical space displayed on a display device for each player participating in a network game is managed. Also, a plurality of parameters, including a number of breeding days, strength, stamina and judgment, are set in a breeding character which each player breeds, and managed in a server apparatus. Although the number of breeding days is updated at a daily prescribed time, the strength, the stamina and the judgment are updated in accordance with details of breeding which each player has carried out for the breeding character.

Abstract: In a network game system, as well as causing a player to appreciate a growth of a character in accordance with an elapsing of time, to cause the player not to feel a strangeness either in a display of a character which another player is breeding. A visible range of a hypothetical space displayed on a display device for each player participating in a network game is managed. Also, a plurality of parameters, including a number of breeding days, strength, stamina and judgment, are set in a breeding character which each player breeds, and managed in a server apparatus. Although the number of breeding days is updated at a daily prescribed time, the strength, the stamina and the judgment are updated in accordance with details of breeding which each player has carried out for the breeding character.