Patent ID: 8479002

Claim:
An electronic certificate issuing device to issue an electronic certificate and a private key corresponding to the electronic certificate for each of a plurality of communication devices communicably connected to the electronic certificate issuing device, comprising: a connecting interface, through which an external storage device can be removably connected to the electronic certificate issuing device; an obtaining system configured to obtain information regarding a node ID assigned to each of the plurality of communication devices by requesting each of the plurality of communication devices for the node ID; a generating system configured to generate a certification set for each of the plurality of communication devices whom a node ID was obtained, where a certification set includes an electronic certificate and a private key corresponding to the electronic certificate, the electronic certificate including a node ID indicated in the information regarding the node ID of the communication device obtained by the obtaining system as owner ID information of the electronic certificate and the private key corresponding to the electronic certificate for the communication device; and a writing system configured to collectively write a plurality of certification sets, one certificate set for each of the plurality of communication devices whom a node ID was obtained into the external storage device connected to the first connecting interface in a batch.