NETWORK GAME SYSTEM, NETWORK GAME SYSTEM CONTROL METHOD, GAME MACHINE, GAME MACHINE CONTROL METHOD, AND INFORMATION STORAGE MEDIUM

To provide a network game system for sharing, among a plurality of game machines, the positions and postures of objects associated with the game machines, while suppressing an increase in traffic in the communication network. Each of the game machines comprises a first base position selection unit for selecting one of the plurality of base positions; a first base position transmission unit for transmitting the base position selected by the first base position selection unit to another game machine; a first base position receiving unit for receiving the base position transmitted by the first base position transmission unit from another game machine (10); a second base position selection unit for selecting one of the base positions received by the first base position receiving unit; an own object position determination mans for determining a position of an object associated with the game machine (10) based on the base position selected by the first base position selection unit; and an own object posture determination unit for determining posture of the object associated with the game machine (10) based on the base position selected by the second base position selection unit.