Abstract: An authentication system includes service providing systems, a global ID platform, and a terminal device owned by a user. The first service providing system includes a first authentication server and a first back-end server. The first back-end server provides a first service. The second service providing system includes a second authentication server and a second back-end server. The second back-end server provides a third service. The user is a member of the first service and has a user ID of the first service. When the user requests global login to the third service, the global ID platform relays the request from the second authentication server to the first authentication server and relays an authentication result, returned by the first authentication server for the request, from the first authentication server to the second authentication server.

Abstract: A reward point management device includes one or more processors configured to: calculate a safe driving score based on safe driving points corresponding to a degree of safe driving of a user according to a user's driving behavior in a leased vehicle; calculate an eco-driving score based on eco-driving points corresponding to a degree of eco-driving of the user according to the user's driving behavior in the leased vehicle; calculate a service score based on service entry information on the leased vehicle; and calculate reward points to be given to the user based on the safe driving score, the eco-driving score, and the service score.