NETWORK SYSTEM, IDENTIFICATION INFORMATION MANAGEMENT METHOD, SERVER DEVICE, PROGRAM AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a network system or the like for reducing the business for managing identification information. SOLUTION: When a member of a corporation logs in, in placing an order, an arbitrary ordering number can be input, and registered with correspondence to an order receiving number issued by a site, whereby the business for managing the identification information by a user can be reduced.