An intermediary server includes circuitry to receive, from a reservation management server, resource identification information for identifying a resource. The reservation management server manages a reservation for the resource and receives the reservation from a registration terminal that registers the reservation. The circuitry further transmits, to a drive control server, drive device identification information for identifying a drive device corresponding to the resource identification information. The drive control server remotely controls the drive device used to unlock the resource. The circuitry further receives, from the drive control server, authentication information to be used to unlock the resource with the drive device identified by the drive device identification information. The circuitry further receives, transmit, to the registration terminal, the authentication information.