A system for calculating biological information under exercise load, including a sensor device for measuring a motion of a user, a portable heart rate sensor for measuring a heart rate of a user, and a server including a biological information calculation function, wherein the system measures a motion of a user under exercise load on the user, measures the heart rate of the user after the stop of the exercise load, measures a temporal difference between the stop of the exercise load and measurement of the heart rate, estimates a drop in the heart rate based on the temporal difference and finds an estimated heart rate immediately before the stop of exercise of the user, and calculates biological information of the user under the exercise load based on the motion of the user under the exercise load and the estimated heart rate.
