A mobile communication terminal provided with a tuning function, which saves a player the trouble of carrying around a tuning meter or the like and facilitates the tuning of instruments. A user designates a reference pitch stored in a memory, and inputs the sound of an instrument or a voice into a microphone. A synthesizer generates a sound that most approximates the sound input through the microphone according to the reference pitch designated by the user. The sound generated by the synthesizer is compared with the sound input through the microphone, and the result of the comparison is displayed on a display.