Upon obtaining second (first) class information corresponding to a second (first) device newly added to a network, the communication controller refers to fundamental request (notification) information and obtains request (notification) information corresponding to the obtained second (first) class information. The communication controller refers to notification (request) authorization information and obtains second (first) sender information associated with the notification (request) information indicative of the same processing as that indicated by the obtained request (notification) information. The communication controller creates request (notification) authorization information indicative of a combination of the first (second) sender information indicative of the second (first) device newly added to the network, the obtained request (notification) information, and first (second) destination information indicative of the same first (second) device as the first (second) device indicated by the obtained second (first) sender information.