An electronic information authenticating system is provided which is capable of providing enhanced security of specified electronic information and its related information in the terminal without causing high costs. In a board storing region in a ticket managing board in a portable information terminal, related information passed from a ticket issuing server to which an access is permitted by a board AC (Access Control) unit is stored. A UA (User Agent), ticket board managing server, and ticket issuing server are accessible to the board storing region. An electronic ticket to which consideration on security needs to be given is stored in a secure memory retaining enhanced security, however, the electronic ticket to which consideration on security needs not to be given is put into the board storing region being at low costs.