To provide public communication terminal equipment capable of selectively using a public standard telephone network (PSTN) function and the Internet telephone (VoIP) function.

This public communication terminal equipment is provided with an input part including a plurality of functional keys capable of selecting the various functions of public communication terminal equipment or inputting telephone numbers; a display device for displaying the various operations of the public communication terminal equipment, and for displaying input information to be inputted through the input part; an MODEM for connecting a telephone network, Internet network, and public communication terminal equipment in a communication enabling state; a verifying means for verifying a payment means; a transmitter/receiver for converting the voice signal of a user into an electric signal, or for converting the voice signal into actual sound; a hook switch to be switched by the operation of the transmitter/receiver; and a means for converting the voice signal to be inputted through the transmitter/ receiver in an Internet telephone mode into the voice data, and for transferring a signal to be inputted from the transmitter/receiver in a standard telephone mode to the MODEM.