PURPOSE: To constitute the system so that even when a person to be examined becomes an emergency state in other place than a hospital, it is possible to cope therewith by transmitting a body surface potential signal of the person to be examined to an electrocardiogram analyzing device of the hospital by a telephone system.

CONSTITUTION: A telephone system 5 of a hospital 4 is called by using a telephone system 3 in home 2 of a person 1 to be examined, and after informing a fact that a body surface potential signal of the person 1 to be examined is transmitted, an electrocardiogram detector 6 is set to a transmitter 3A of the telephone system 3, and by placing it on the breast part, the body surface potential as electrocardiogram data is detected, its detecting signal is converted into an acoustic pressure signal which can be transmitted by the telephone system 3, and thereafter, it is transmitted to the telephone system 5 of the hospital 4 through the transmitter 3A, the telephone system 3, a telephone circuit 7, a central office exchange 8, and a telephone circuit 9. Its acoustic pressure signal is inputted to a signal converter 10 coupled on a receiver 5A of the telephone system 5, its acoustic pressure signal is demodulated by the signal converter 10, and by inputting the demodulated body surface potential signal of the person 1 to be examined to an electrocardiogram analyzing device 11, an electrocardiogram of the person 1 to be examined is displayed, and a state of a circulating function can be analyzed.