A terminal unique information transmission method comprising: a server receiving, from a terminal, a terminal unique information acquisition request including a terminal unique public key certificate of the terminal; the server generating an encrypted terminal unique public key certificate by encrypting the terminal unique public key certificate of the terminal; the server referring to a discarded terminal information table in which encrypted terminal unique public key certificate of a terminal not permitted to acquire the terminal unique information is described; the server checking whether the generated encrypted terminal unique public key certificate is described in the discarded terminal information table; and the server transmitting, when the generated encrypted terminal unique public key certificate is not described in the discarded terminal information table, a terminal unique information of the terminal to the terminal characterized in that the terminal unique information transmission method further comprises: the server receiving, from the terminal, a terminal unique information update request including an other encrypted terminal unique public key certificate obtained by encrypting a terminal unique public key certificate of an other terminal and a restoration destination terminal certificate list in which at least the terminal unique public key certificate of the terminal is described as a latest element; the server checking whether the other encrypted terminal unique public key certificate is described in a terminal unique information table; and the server transmitting, when the other encrypted terminal unique public key certificate is described in the terminal unique information table, the terminal unique information associated with the other encrypted terminal unique public key certificate to the terminal and describing the other encrypted terminal unique public key certificate in the discarded terminal information table. a server receiving, from a terminal, a terminal unique information acquisition request including a terminal unique public key certificate of the terminal; the server generating an encrypted terminal unique public key certificate by encrypting the terminal unique public key certificate of the terminal; the server referring to a discarded terminal information table in which encrypted terminal unique public key certificate of a terminal not permitted to acquire the terminal unique information is described; the server checking whether the generated encrypted terminal unique public key certificate is described in the discarded terminal information table; and the server transmitting, when the generated encrypted terminal unique public key certificate is not described in the discarded terminal information table, a terminal unique information of the terminal to the terminal characterized in that the terminal unique information transmission method further comprises: the server receiving, from the terminal, a terminal unique information update request including an other encrypted terminal unique public key certificate obtained by encrypting a terminal unique public key certificate of an other terminal and a restoration destination terminal certificate list in which at least the terminal unique public key certificate of the terminal is described as a latest element; the server checking whether the other encrypted terminal unique public key certificate is described in a terminal unique information table; and the server transmitting, when the other encrypted terminal unique public key certificate is described in the terminal unique information table, the terminal unique information associated with the other encrypted terminal unique public key certificate to the terminal and describing the other encrypted terminal unique public key certificate in the discarded terminal information table. the server receiving, from the terminal, a terminal unique information update request including an other encrypted terminal unique public key certificate obtained by encrypting a terminal unique public key certificate of an other terminal and a restoration destination terminal certificate list in which at least the terminal unique public key certificate of the terminal is described as a latest element; the server checking whether the other encrypted terminal unique public key certificate is described in a terminal unique information table; and the server transmitting, when the other encrypted terminal unique public key certificate is described in the terminal unique information table, the terminal unique information associated with the other encrypted terminal unique public key certificate to the terminal and describing the other encrypted terminal unique public key certificate in the discarded terminal information table.