A facsimile apparatus transmitting a subaddress signal includes an extension number input block for inputting a plurality of extension numbers, a second telephone number input block for inputting a plurality of secondary telephone numbers, and a direct input block for inputting particular information through numeric keys, an asterisk (*) key and a sharp (#) key. When the subaddress signal is directly input in the facsimile transmission, with one of the symbols # and ## input and the subaddress signal happens to coincide with the definition of the signal specified in the ITU-T Recommendation T. 33, an operator checks to see whether the transmission of the signal complied with the signal format of the ITU-T Recommendation T. 33 is selected. The facsimile transmission is thus performed as the operator intends.