A telephone terminal includes: a main unit; an optional unit that performs an arbitrary additional communication function and detachably attached to the main unit; a distribution unit that distributes a drive power supplied through a communication network into a first channel and a second channel when a power of the telephone terminal is turned on; a first power supplying unit that supplies the first channel of the drive power to the main unit at a first timing; and a second power supplying unit that supplies the second channel of the drive power to the optional unit at a second timing shifted from the first timing.