To put remote supervision, management and control for each field into practice and to attain miniaturization of the portable transmitter at a low cost by sending an image signal from a camera and an audio signal from a microphone to a center equipment in real time by a digital communication means.

Video signal input sections 3A-3D such as BNC connectors to wire video signal wires connected respectively to, e.g. four supervisory cameras installed to a shop side are placed on a printed circuit board 2 built in an image transmission terminal equipment main body 1. Furthermore, an 8-pin modular connector 4 is placed at a rear side of the BNC connector on the printed circuit board 2 and a line connector 5 as an ISDN communication line input output section or a DSVN communication line input output section is connected to the connector 4. Thus, the connector 5 is used for connection to an ISDN communication line or a DSVN communication line through which image, audio and data signals at the shop side are transferred to a supervisory center.