1. A sound source evaluation method, comprising: comparing test performance information obtained by quantifying sound source properties over a performing time from a test sound source which is provided, with reference performance information obtained by extracting and statistically analyzing sound source properties over the performing time from a plurality of sound sources which are qualified, which have the same attribute as the sound source properties over the performing time from the test sound source; and calculating a creativity index representing a difference of the sound source properties of the test performance information with respect to the sound source properties of the reference performance information in the performing time.