Network game system for playing a game with the aim of a achieving a predetermined goal. The game is played, via data terminals operated by member players, in a game space provided on a game server, while communicating with the game server on the network. The game server includes a recruiting information generating section for generating, upon receipt from a member player of referral information specifying the mail address of the data terminal of a non-member player, recruiting information including information specifying the member player, an enrollment processing section for performing enrollment processing upon receiving application information in response to recruiting information sent to the mail address of the non-member, and an advantage conferring section for conferring to the referring member player advantages useful in achieving the goal of the game.
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