mobile communication terminal has a typical configuration including a radio frequency rf unit 111 a data processor 113 a display unit 115 a memory unit 117 a key input unit 119 an audio processor 121 a controller 123 and an mp3 player 125 that is an audio file player the rf unit 111 performs the wireless communication functions of the mobile communication terminal the rf unit 111 includes an rf transmitter that up converts the frequency of a signal to be transmitted and amplifies the signal and an rf receiver that low noise amplifies a received signal and down converts its frequency the data processor 113 includes a transmitter that encodes and modulates the signal to be transmitted and a receiver that demodulates and decodes the received signal that is the data processor 113 includes a modulator demodulator modem and a coder decoder codec the codec includes a data codec for processing incoming data such as packet data and an audio codec for processing audio signals such as voice signals the display unit 115 displays data controlled and outputted by the controller 123 for example in the present embodiment the display unit 115 displays a music file playback function stored music file lists and music files stored in each music file list the memory unit 117 includes a program memory for performing mobile communications and a data memory the program memory stores programs for controlling the general operations of the mobile communication terminal and a.