Abstract: An operation terminal (120) requires an input of an authentication code when an authority granting request for corresponding electronic information to a tag (100) is received from a user, and transmits the authentication code to a server together with the authority granting request. The server (140) has an authentication code memory unit (142) that stores the authentication code for each tag, and an authorized user management unit (144) that manages the authorized user for each tag. In the case where an authority granting request and an authentication code are received from the operation terminal (120), the server (140) registers the user of the operation terminal (120) with the authorized user management unit (144) as an authorized user of the tag (100) under the conditions that an authorized user of the tag (100) is not registered with the authorized user management unit (144) and the received authentication code matches the contents of the authentication code memory unit (142).