To provide an authentication technology capable of increasing safety, and suppressing a load of communication processing with a simple operation.SOLUTION: An authentication server transmits a first token to a first terminal which requests access to an application server, and receives a second token transmitted from a second terminal capable of performing LTE communication, and transmitted via an EPC, and determines whether or not the first token matches the second token, and when the first token matches the second token, acquires LTE user information specifying a user of the LTE communication related to the second terminal from the EPC, and determines whether or not the LTE user information is information permitting login to a database of application user information specifying a user permitted to perform access to the application server, and when the LTE user information is the information permitting the login to the database of the application user information, transmits login permission to permit the access request from the first terminal to the application server.SELECTED DRAWING: Figure 2
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