PURPOSE: To provide a network game system capable of performing complicated game development and performing fertile game development.

CONSTITUTION: This network game system is constituted in such a way that user game devices 1-1, 1-2,..., 1-n are connected to a central control unit 3 via telephone lines 2-1, 2-2,..., 2-n, and game devices 5-1, 5-2,..., 5-m for Job to the central control unit via telephone lines 4-1, 4-2,..., 4-m, respectively. A user is provided with each of the game devices 1-1, 1-2,..., 1-n, and also sets data proper to a character on every kind of game. The central control unit 3 executes by developing a game based on the data proper to the character. The game devices 5-1, 5-2,..., 5-m for job display the game by game relay data from the central control unit 3.