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