A portable telephone which enables operations other than transmission and reception functions, such as retrieving telephone numbers, creating e-mails, playing games, without emitting strong electromagnetic waves even in areas where communication by a portable telephone is prohibited, thereby preventing occurrence of misunderstanding by or disturbance to a third person. The multifunctional portable telephone is composed of a telephone function control unit (102) for controlling telephone functions as a whole, a non-telephone function control unit (103) for controlling non-telephone functions, a system control unit (104) for controlling the entire device, an input unit (105) comprising a mode key (15), telephone function operation changeover keys (16) and (17), dial keys (18), and the like, a display unit (106), and an external notification unit (107) for externally informing the operational state of telephone functions, wherein the system control unit (104), while a function other than a function utilizing radio wave transmission or transmission and reception is being performed, stops the telephone function control unit (102) from performing radio wave transmission or transmission and reception as well as enables the external notification unit (107) to inform that radio wave transmission or transmission and reception is in a stop state.