an authentication request receiving unit configured to receive a first authentication request from the second terminal in response to the signal, wherein the second terminal detects whether or not {HEAD ~ a terminal authorization certificate} is present at {TAIL ~ the terminal} based on the beacon information and transmits the authentication request when it is determined that the second terminal authorization certificate is present at the terminal 
an authentication request receiving unit configured to receive a first authentication request from the second terminal in response to the signal , wherein the second terminal detects whether or not { HEAD ~ a terminal authorization certificate } is present at { TAIL ~ the terminal } based on the beacon information and transmits the authentication request when it is determined that the second terminal authorization certificate is present at the terminal
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