DATA TRANSMITTING/RECEIVING APPARATUS AND ELECTRONIC CERTIFICATE ISSUING METHOD

摘要

A management unit (110), which issues an electronic certificate to a first-time transmission unit (410), has a wireless communication part that communicates in a network (300) and also has a wire communication part to which the first-time transmission unit (410) can be connected. When the first-time transmission unit (410) is wire-connected to the management unit (110), the management unit (110) determines, based on received device type information of the first-time transmission unit (410), whether the first-time transmission unit (410) has any communication means capable of communicating in the network (300). If so determining, the management unit (110) uses a device identifier specific to the first-time transmission unit (410) to make an electronic certificate, and then transmits it to the first-time transmission unit (410).