PROBLEM TO BE SOLVED: To provide a posture change determination system, a method and a program for supporting a long-term bed rest to surely perform a posture exchange and managing the time when the posture exchange is performed. SOLUTION: A management device 100 of a body position change determination system 1 has a function of lying down from a signal receiving unit 151 for receiving a detection signal from a vibration sensor 230 included in the detection device 200 and a detection signal subjected to Fourier conversion. The body position exchange determination unit 152 that determines whether or not the person has performed the body position exchange and the body position exchange that stores the time of the detection signal that determines that the person has performed the body position exchange in the body position exchange time DB 141 It includes a time storage unit 153 and an alert output unit 154 that outputs an alert when a predetermined time has elapsed since the body position was changed. [Selection diagram] Fig. 1【課題】長期臥床者に対する体位交換を確実に行うことを支援し、体位交換を行った時刻を管理する体位変化判定システム、方法及びプログラムを提供する。【解決手段】体位変化判定システム１の管理装置１００は、その機能として、検出装置２００が備える振動センサ２３０からの検知信号を受信する信号受信部１５１と、フーリエ変換を行った検知信号から、臥床者が体位交換を行ったか否かの判定を行う体位交換判定部１５２と、体位交換を行ったと判定した検知信号について、その時刻を体位交換を行った時刻として体位交換時刻ＤＢ１４１に記憶する体位交換時刻記憶部１５３と、体位交換を行ってから所定時間経過した場合に、アラートを出力するアラート出力部１５４と、を備える。【選択図】図１
