To solve a problem in which a user needs to follow a procedure in advance, for example, by printing and carrying a service ticket to a store and it is difficult for the user to follow individual procedures by stores although a system that makes it possible to receive service of discount by using a service ticket issued at a web site etc., for sales promotion of an article is available from before.
This server device for user authentication sends picture information for user authentication to display a picture for user authentication representing the right to receive specified service by making a user let a store clerk view to a user's mobile terminal device. The user registers oneself in the beginning and is then able to receive the service at many stores affiliated to the system. Consequently, the user is released from troublesome operations for being provided with service tickets by stores one by one.
OTAKA JUN
SHIMIZU HISASHI
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