The present invention, by determining whether or not includes a detection target of the sound source in the sound information collected by the sound collector with high precision, appropriate noise model for each environment and to provide the generated noise model generator for. The present invention relates to a noise model generator for generating a noise model relating to a noise information other than the sound source to be detected contained in the collected sounds information in the sound collector, a power spectrum from the collected sounds Information to get the, of the power spectral probability density distribution is determined whether or not are included detection target of a sound source in the sound information that has been collected by evaluating the (histogram), collected have been of sound information If determined not to contain a detection target of the sound source generating a noise model from the collected sounds information during.
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