As for the biological information processing device, the estimate expedient which estimates the future certification precision which uses the above-mentioned organism information the territory where it has the possibility of fluctuating from midst of the above-mentioned organism information according to calculation expedient and smooth the above-mentioned each feature line respectively smoothing expedient and the finite difference calculation expedient which calculates the finite difference of direction of the above-mentioned each feature line and direction of each feature line which is smoothed respectively and was calculated each finite difference which calculate the direction of each feature line which is included in the organism information which was picked from the user respectively, as the fluctuation candidacy territory the detection expedient which it detects and, this on the basis of the fluctuation candidacy territory which is detected and,It has.生体情報処理装置は、ユーザから採取された生体情報に含まれる各特徴線の方向をそれぞれ算出する算出手段と、上記各特徴線をそれぞれ平滑化する平滑化手段と、上記各特徴線の方向と平滑化された各特徴線の方向との差分をそれぞれ算出する差分算出手段と、算出された各差分に応じて、上記生体情報の中から変動する可能性のある領域を変動候補領域として検出する検出手段と、この検出された変動候補領域に基づいて上記生体情報を用いた今後の認証精度を予測する予測手段と、を備える。
