A brain activity signal from which noise has been removed is derived from a biological optical measurement signal including a noise signal without complicating the device configuration. In the biological optical measurement data analyzing apparatus and analyzing method, the brain activity signal corresponding to repeated experiment tasks shows the same signal change with each repetition and the oxygenated hemoglobin concentration change signal which is the brain activity signal and deoxygenation And the hemoglobin density change signal are inversely correlated with each other, a signal obtained by multiplying each signal obtained from a plurality of measurement regions observed almost at the same time by a weighting factor optimized for each brain, As an activity signal component.装置構成を複雑にすることなく、雑音信号を含む生体光計測信号から、雑音を除去した脳活動信号を導出する。 生体光計測データ解析装置および解析方法において、繰り返し行われた実験タスクに対応する脳活動信号は毎回の繰り返しで同様の信号変化を示し、なおかつ脳活動信号である酸素化ヘモグロビン濃度変化信号と脱酸素化ヘモグロビン濃度変化信号とが逆相関の関係にあるという条件のもとで、ほぼ同時に観測された複数の計測領域から得られた信号のそれぞれに最適化した重み係数を乗じて合成した信号を脳活動信号成分として算出する。
