PURPOSE: To realize the power saving of a battery, etc., by dividing the time and the place of read-in and transmission, executing the transmission at the time when a radio wave state and a circuit state are good, and also, executing the transmission after confirming in advance a read-in error, and printing out only a necessary one as for a received FAX.

CONSTITUTION: The portable telephone set is provided with a means for executing transmission and reception or transmission/reception automatically in accordance with a FAX transmitting/receiving protocol after transmission and after reception, a FAX automatic manual transmission/reception switching button for selecting a means for transmitting and receiving an image signal by switching the FAX transmitting/receiving protocol by a FAX manual transmission/reception button, in the course of transmitting and receiving a sound signal, and an image signal storage means 66 for storing temporarily an image signal read for transmission and received image signal on the inside.