USER AUTHENTICATION SYSTEM AND PROCESSING METHOD THEREFOR, AND RECORDING MEDIUM RECORDED WITH THE PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To make an ID and a password common to each other between different service providing systems SS. SOLUTION: The service providing system SS transmits an authentication request of a user who is about to log in to a network banking system NT through a public network 20. The user inputs ID and the password to the network banking system NT, and transmits the authentication result from the network banking system NT to the service providing system SS through the public network 20. Since the authentication result includes information on whether the user is a legal user or not, the service providing system SS determines whether log-in is permitted or not according to the authentication result.