a verifying unit configured to verify the first terminal authorization certificate included in the first authentication request received by the authentication request receiving unit using a public key included in the public key certificate stored in {HEAD ~ the terminal authorization certificate} issuing {TAIL ~ terminal list table}; and 
a verifying unit configured to verify the first terminal authorization certificate included in the first authentication request received by the authentication request receiving unit using a public key included in the public key certificate stored in { HEAD ~ the terminal authorization certificate } issuing { TAIL ~ terminal list table } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH