System and method for observing heart rate of passenger

PURPOSE: A system and a method for observing the heart rate of passengers are provided to periodically evaluate the optimal signal among multiple signals, thereby obtaining a correct heart rate. CONSTITUTION: A plurality of heart rate detection sensors (500) is composed of different kinds. The heart rate detection sensor is provided to a seat cushion (300) or a seat back (100). The heart rate detection sensor comprises an electrocardiogram sensor (510). A control unit produces the accuracy of each waveform. The control unit calculates a heart rate with the most accurate waveform.