To improve the operability of a telephone set by setting a function corresponding to the operation of a function provided in the telephone set according to plural key operating means and one or plural key operations of the key operating means, and by performing voice output of a function name set linking with the key operation.

A controlling part 4 performs setting of various functions of a telephone set, display control of a displaying part 5, the transfer of key operation information to a voice synthesis controlling part 10, etc., in addition to dial call out in accordance with the key operation of a key matrix 6. Voice data such as the Japanese syllabary is previously registered on a voice ROM 10b and a voice synthetic IC 10a reads the voice data from the ROM 10b according to a command from the part 4, performs voice synthesis, sends the data to a voice processing part 7 and outputs a voice from a speaker 9. Each time a numeric key in the matrix 6 is depressed, the part 4 shows the depressed numeric number on an LCD displaying part 5 and communicates the depressed numeric key information to the part 10.