A health level determination device (terminal device (51)) that determines the health level of a subject person is extracted from a captured image of the organ of the subject person, and a feature amount input unit (communication) to which a feature amount used for the health level judgment is input Part (54)) and the feature quantity of the subject inputted through the feature quantity input unit with the distribution of the feature quantity of the population, so that the subject's constitution corresponding to individual differences from others And a determination unit (53) for determining a change in the physical condition of the subject. When the determination unit (53) determines the bias of the subject's constitution, the distribution of the feature amount of the other person, which is created for other people as the distribution of the feature amount of the population, is used to change the physical condition of the subject. Is used as the distribution of the feature quantity of the population, the distribution of the feature quantity of the subject person collected within the evaluation period for evaluating the physical condition.対象者の健康度を判定する健康度判定装置（端末装置（５１））は、対象者の器官の撮影画像から抽出され、健康度の判定に用いる特徴量が入力される特徴量入力部（通信部（５４））と、上記特徴量入力部を介して入力された対象者の特徴量を、母集団の特徴量の分布と比較することにより、他人との個人差に相当する対象者の体質の偏りと、対象者の体調の変化とを判定する判定部（５３）とを備えている。判定部（５３）は、対象者の体質の偏りを判定する場合、母集団の特徴量の分布として、他人を対象として作成される、他人の特徴量の分布を用い、対象者の体調の変化を判定する場合、母集団の特徴量の分布として、体調を評価する評価期間内で集めた対象者本人の特徴量の分布を用いる。
