Provided is an information processing method for more accurately calculating an absorption spectrum of blood from light emitted to a living body such as a human finger. A pulsation signal corresponding to each of the plurality of wavelengths is measured based on the near-infrared light received from the living body by irradiating the living body with near-infrared light of a plurality of wavelengths, and the measured wavelengths are measured. The present invention provides an information processing method for calculating an absorption spectrum based on a change width of a pulsation signal from which noise has been removed by performing a principal component analysis on multi-wavelength time-series data including a pulsation signal corresponding to.ヒトの指などの生体に照射された光から血液の吸収スペクトルをより精度よく算出する情報処理方法を提供する。生体に複数の波長の近赤外光を照射して前記生体から受光した前記近赤外光に基づいて前記複数の波長の各波長に対応する脈動信号を測定し、前記測定された前記各波長に対応する脈動信号を含む多波長時系列データに対する主成分分析によってノイズを除去した脈動信号の変化幅に基づいて吸収スペクトルを算出する情報処理方法を提供する。
