Server, certificates constructing indicating means and program

The server certificate of IP address of generation instruction unit (101) instruction server certificate generating unit (106) generation comprising the server (100) being connected via network with terminal installation (200) on network.The server certificate that certificate storage part (102) storage is generated by server certificate generating unit (106) according to the instruction of generation instruction unit (101).Communication unit (103) is communicated using the server certificate for being stored in certificate storage part (102) with terminal installation (200).