PURPOSE: To obtain an apparatus which achieves a complicated treatment control and operation with a lower power consumption with higher safety of patients by enabling real time recognition of arrhythmia with a very high accuracy and speed. CONSTITUTION: A neural circuit network 21 is provided with a hierarchal structure which contains a first level 21A to classify individual waveforms of a physiological signal, a second level 21B to diagnose arrhythmia detected and a third level 21C to perform a treatment in response to arrhythmia diagnosed. Also arranged are a pace maker 15 of a heart 14, a defibrillator 17 and a microprocessor 16 to control the components. COPYRIGHT: (C)1992,JPO