Abstract: End pulse wave measurement means 3 measures an end pulse wave. Heart rate computation means 16 computes a heart rate per unit time from the measured end pulse wave. Autonomic nervous balance computation means 17 defines the heart rate per unit time as HR, and calculates an approximate value HFa of the autonomic nervous balance by Equation (1) below: HFa=k1*HR3+k2*HR2+k3*HR+k4??Equation (1) where k1=?0.0003, k2=0.0796, k3=?8.5795, and k4=325.3. This makes it possible to obtain autonomic nervous balance from the heart rate HR. Hence, the autonomic nervous balance is determined through measurement for a short period.

Abstract: Septuplicate concentric semi circles are defined (S103). An intersection pk of kth straight line and kth circle is calculated (step S107). A point p (k?1) and a point are connected with a line segment (S109). In this case, a point p0 and a p1 are connected with a line segment because K=1. It is judged whether the processing number k is the final (S111). If is not the final, the processing number k is incremented (S113), and repeats the processing after Step S107. Time-series data can be displayed so as to clearly distinguish variations without varying the angle(s).