To reduce the burden of administering a service, thereby inducing utilization of the service. An access administration system includes a publisher DB 21, access data verification unit 24, access data determiner 25, access data issuing unit 1, an access submission unit 6. The publisher DB 21 stores publisher information pertaining to publishers who are authorized to issue predetermined access data. The access data verification unit 24 verifies the legitimacy of the access data received. The access determination unit 25 determines the access according to the access data received and a result of the verification, and reports the access to a service provision device. The access data issuing unit 1 generates access data. The access submission unit 6 sends access data to the access data verification unit 24. When access data can be granted to a user by a user that is not the publisher of the access data, it is preferred that the system includes a supplemental data issuing unit 3, which generates a supplemental data and appends the supplemental data to the access data, thereby creating a new access data. For verification of the legitimacy of the access data and supplemental data, it is preferable that digital signatures according to a public key encryption system be used.