Abstract: An information processing device includes a meeting determination unit, an authentication reception unit, and an authentication determination unit. The meeting determination unit determines whether a user who is an authenticatee meets a user who is an authenticator based on information received from terminals used by the users. The authentication reception unit receives information indicating that an authentication operation is performed for the authenticatee from the terminal of the authenticator who is determined to have met the authenticatee. The authentication determination unit permits the authenticatee to use a predetermined information service, when receiving, from a predetermined number of terminals of authenticators, the information indicating that the authentication operation is performed for the authenticatee.

Abstract: An information processing device includes a meeting determination unit, an authentication reception unit, and an authentication determination unit. The meeting determination unit determines whether a user who is an authenticatee meets a user who is an authenticator based on information received from terminals used by the users. The authentication reception unit receives information indicating that an authentication operation is performed for the authenticatee from the terminal of the authenticator who is determined to have met the authenticatee. The authentication determination unit permits the authenticatee to use a predetermined information service, when receiving, from a predetermined number of terminals of authenticators, tho information indicating that the authentication operation is performed for the authenticatee.