When a body composition is measured by an earphone in a body composition analyzer and a smart device through data communication, the connection between the earphone plug of the body composition analyzer and the earphone port of the smart device is checked. A current is outputted though an electrode which is in direct contact with the body of a testee. A measurement signal is generated by measuring the electrical resistance of the body of the testee by the current of the electrode. The measured signal is changed into a digital data signal. The digital data signal is outputted through the output terminal of the ear phone plug.COPYRIGHT KIPO 2014[Reference numerals] (S710) Check the connection with a smart device through an earphone plug (S720) Apply current to the body of a testee through an electrode (S730) Measure the electrical resistance of the body of the testee through the electrode (S740) Change the measured signal into a digital data signal (S750) Output the digital data signal through the earphone plug체성분 측정기와 스마트 기기가 이어폰을 이용하여 데이터 통신을 통해 체성분 측정 시, 체성분 측정기의 이어폰 플러그와 스마트 기기의 이어폰 포트의 접속을 확인하고, 피측정자의 신체와 직접 접촉되는 전극을 통해 전류를 출력하고, 전극을 통해 전류에 의한 피측정자의 신체의 전기적 저항 값을 측정하여 측정 신호를 생성하고, 측정 신호를 디지털 데이터 신호로 변환하고, 디지털 데이터 신호를 이어폰 플러그의 출력 단자를 통해 출력한다.
