To output a voice guide of high sound quality at a low cost by utilizing the existing signal processing LSI and DSP (Digital Signal Processor) for decompressing voice data compressed by a prescribed compression method.

An audio decoder 14 decodes voice data encoded by the prescribed compression method, and a microcomputer 3 stores a voice guide showing from which speaker test tone is output when respective multichannel speakers sequentially output the test tone by voice data encoded in advance by a compression method decodable by the audio decoder, and controls the audio decoder so as to decode the voice data and output the voice data to any of the respective multichannel speakers when generating the test tone.