[PROBLEMS] A system for automatically minimizing cardiac oxygen consumption that is capable of estimating a patient's amount of cardiac oxygen consumption with high accuracy and moreover capable of minimizing the amount of cardiac oxygen consumption and a cardiac disease treating system are provided.[MEANS FOR SOLVING PROBLEMS] The cardiac disease treating system 10 comprises an input part 12 for inputting a patient's 20 indexes of kinetics of blood circulation including at least heart rate, a cardiac oxygen consumption calculation monitor unit 14 for calculating the estimated value of said patient's 20 amount of cardiac oxygen consumption based on the indexes of kinetics of blood circulation input from the input part 12, and a cardiac oxygen consumption curtailment unit 16 for comparing the heart rate input from the input part 12 and the critical heart rate minimizing the estimated value of amount of cardiac oxygen consumption calculated by the cardiac oxygen consumption monitor unit 14 and controlling the patient's 20 heart rate in conformity with the results of this comparison.