Abstract: In a portable telephone set, an input audio signal such as an audio signal is received through a microphone (111), and is then amplified by an amplifier (112). The output of the latter (112) is applied through an analog-to-digital converter (113) to a DSP (301), where it is compressed and stored in a memory (303) with the aid of a CPU (302), or it is stored therein as it is. Here, an audio signal from outside which is stored in the portable telephone set can be used as a calling sound or alarm sound. Therefore, selection of calling sounds or alarm sounds in the portable telephone set of the invention is wider than in the conventional one.