An image communication device which transmits and receives image data through an IP network by using a call control protocol, and in particular, a facsimile machine which prevents a wrongful reception of the image data by spoofing by transmitting the image data after confirming that a connected destination is a true destination. Before establishing a media session by the SIP and transmitting image data, an image communication device of a transmitter transmits prescribed first text data to an image communication device of a recipient by the SIP method and receives text data from the image communication device of the recipient. When the received text data is prescribed second text data, the image communication device of the transmitter transmits the image data to the image communication device of the recipient.