Abstract

An authentication system which uses an authentication priority list based on dynamic and virtual grouping of terminals used for authentication, resulting in an efficiency improvement of authentication priority sequence in 1:N type authentication, and hybrid authentication by switching authentication logic between 1:1 and 1:N authentication. Masking of pre-logged-in users for the authentication priority list in 1:N authentication improves the efficiency of the authentication priority sequence in 1:N type authentication.