NETWORK SYSTEM, AND SERVER DEVICE FOR USE IN THE SAME, METHOD AND COMPUTER PROGRAM FOR CONTROLLING SERVER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a network system and the like that enable an electronic value to be utilized within a fixed range without requiring a registration of personal information.SOLUTION: In a network system in which a balance of a virtual currency associated with personal information on a user and in association with a unique user ID for each user is recorded in data D41 on balance information, the network system is configured to: add or deduct an amount of the virtual currency in response to a purchase request or consumption request in which a user ID or a card ID strung with the user ID is designated; when the card ID is designated and a usage of the virtual currency is requested, determine whether or not the user ID strung with the card ID exists (S103); and when it is determined that the user ID strung with the card ID does not exist, generate a provisional user ID not associated with the personal information (S131); and string the provisional user ID with the card ID (S132).