PROBLEM TO BE SOLVED: To provide a technology for reproducing only predetermined sound such as a warning sound only by a speaker without reproducing the predetermined sound by earphones even when the earphones are used.;SOLUTION: A sound signal from a sound data processing part 2 is always input to both a first mute circuit 3 and a second mute circuit 4, and only a silence function of the second mute circuit 4 is usually made to operate. When emitting warning sound, a reproduction control part 1 for emitting warning sound controls so as to operate the first mute circuit 3 connected to an earphone jack 6 to which the earphones are connected to silence reproduced sound by the earphones and stop the silence function of the second mute circuit 4 connected to the speaker 10. Consequently, the warning sound is reproduced not by the earphones but by only the speaker.;COPYRIGHT: (C)2006,JPO&NCIPI
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