Biological sound, the diagnosis of auxiliary doctor etc. are shown with the mode for being easier to see than [project]. [means] signal processing apparatus (10) handles the result being performed according to the analysis separated to the comparable signal component of normal sound with the signal component for being equivalent to abnormal sound, on the axis of the signal component of corresponding husband, the generation means (104) for the display data that there is the signal for being equivalent to above-mentioned normal sound the amplitude level of the signal component of the amplitude level and above-mentioned abnormal sound that are equivalent to ingredient to generate, and will show that data are output to the output means (104) of display device. [selection figure] Fig. 1
