An information notification device which transfers to a communication device a packet transmitted by a terminal to a relay device. The information notification device is provided with: a communication condition providing unit which provides the packet transmitted by the terminal with communication condition information concerning a communication condition between the terminal and the relay device; a data transmission unit which transmits the packet provided with the communication condition information to the communication device; and a supplementation unit which, in the absence of arrival of the packet from the terminal, implements a notification supplementation process for notifying the communication device of the communication condition information.