a cycle selecting step of superimposing {HEAD ~ the rhythm cycle candidate wave} which is extracted in {TAIL ~ the cycle candidate extracting step}, on the auxiliary wave which is obtained in the auxiliary wave producing step, and selecting a cycle of a rhythm cycle candidate wave which has a peak in the auxiliary wave, as a true cycle 
a cycle selecting step of superimposing { HEAD ~ the rhythm cycle candidate wave } which is extracted in { TAIL ~ the cycle candidate extracting step } , on the auxiliary wave which is obtained in the auxiliary wave producing step , and selecting a cycle of a rhythm cycle candidate wave which has a peak in the auxiliary wave , as a true cycle
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