A cardiac disease treating system has an input part for inputting a patients indexes of kinetics of blood circulation including at least heart rate, a cardiac oxygen consumption calculation monitor unit for calculating the estimated value of said patients amount of cardiac oxygen consumption based on the indexes of kinetics of blood circulation input from the input part, and a cardiac oxygen consumption curtailment unit for comparing the heart rate input from the input part and the critical heart rate minimizing the estimated value of amount of cardiac oxygen consumption calculated by the cardiac oxygen consumption monitor unit and controlling the patients heart rate in conformity with the results of this comparison.
