A reminder terminal creates a table having random letter strings in elements. A user views the created table and registers, at a resource server, a password obtained by arranging first letter strings contained in first elements extracted from the viewed table in accordance with a selection sequence. The created table is stored at the reminder terminal. When the user accesses the resource server, the reminder terminal presents the stored table to the user and transmits information indicative that the stored table is presented. The user obtains a password for the resource server by arranging second letter strings contained in second elements extracted from the presented table in accordance with the selection sequence. Unless the information is received by a management server, the resource server does not permit the user to access contents of the resource server.