PROBLEM TO BE SOLVED: To determine an area where an abnormality signal mixes more reliably without being influenced by frequency characteristics or baseline fluctuation and even when a statistical value in a potential amplitude direction is unknown.SOLUTION: Sensor data is divided into a plurality of zones at a time interval A that is set so that at least one heart rate is included after prescribed pre-processing is applied. Every divided zone, an average length between points where electrocardiogram waveforms cross an original point is divided into a positive side and a negative side, and calculated respectively, and it is determined according to a distance from a center of gravity point of a set of correct answer values whether or not the calculated point expressed by each intersection interval average length on the positive side and the negative side is abnormal.SELECTED DRAWING: Figure 1【課題】周波数特性や基線変動の影響を受けず、また電位振幅方向の統計値が分からなくても異常信号が混入した領域をより確実に判別できるようにする。【解決手段】センサデータを、所定の前処理を施したのち、心拍が少なくとも１つ含まれるように長さが設定された時間間隔Ａで複数の区間に分割し、分割された区間ごとに、心電波形が原点を交差する点間の長さの平均長を正側と負側とに分けてそれぞれ算出し、この算出された正側および負側の各交差点間隔平均長により表される点が異常か否かを、正解値集合の重心点からの距離に応じて判定する。【選択図】図１
