PROBLEM TO BE SOLVED: To superimpose and display a typical waveform of a blood pressure surge and a waveform variation. SOLUTION: A blood pressure surge is detected from time-series data of blood pressure that changes in association with the pulsation of a subject based on a predetermined criterion. For each detected blood pressure surge, the envelope connecting the plurality of beat-corresponding peaks forming the blood pressure surge is obtained as individual waveforms C11, C12, C13, .... Statistical processing of a plurality of individual waveforms C11, C12, C13, ... Obtained is performed to obtain typical waveforms and waveform variations of blood pressure surges in time series data. On the display screen, a process of superimposing the curve Cav showing a typical waveform on the region Sd showing the waveform variation of the blood pressure surge and displaying it is performed. [Selection diagram] FIG. 9【課題】血圧サージの代表的波形と波形ばらつきを重ね合わせて表示すること。【解決手段】被験者の脈動に連動して変化する血圧の時系列データから、予め定められた判定基準に基づいて血圧サージを検出する。検出された各血圧サージについて、その血圧サージをなす複数の拍対応ピークを結ぶ包絡線を個別波形Ｃ１１，Ｃ１２，Ｃ１３，…として求める。複数得られた個別波形Ｃ１１，Ｃ１２，Ｃ１３，…を統計処理して、時系列データ内での血圧サージの代表的波形と波形ばらつきを求める。表示画面上で、血圧サージの波形ばらつきを示す領域Ｓｄに代表的波形を示す曲線Ｃａｖを重ね合わせて表示する処理を行う。【選択図】図９
