PROBLEM TO BE SOLVED: To accurately calculate a cycle ratio or the like even from a signal having no clear peak.SOLUTION: The method includes a phase calculation step of determining, with respect to each of a plurality of signals based on repetitive rhythmics associated with a voluntary motion of a living body, a change amount of phase in a fixed time and a ratio calculation step of calculating a ratio of phase change quantity for each of the plurality of signals calculated in the phase calculation step.COPYRIGHT: (C)2012,JPO&INPIT【課題】 明瞭なピークを持たない信号からでも、サイクル比等を正確に算出する。【解決手段】 生体の随意運動に伴う繰り返しリズム運動に基づく複数の信号のそれぞれについて、一定時間における位相の変化量を求める位相算出過程と、位相算出過程で算出された、複数の信号のそれぞれについての位相変化量の比を算出する比算出過程とをそなえる。【選択図】 図9
