Provided is an endoscopy system including: an image signal generating unit which is connected to one side of a cable, and which includes a signal transmission unit configured to convert an image signal of inner body according to a protocol for long distance transmission and transmit a converted image signal so as to achieve transmission of the image signal through the cable; a signal processing unit connected to the other side of the cable, and receiving the converted image signal transmitted through the cable and converting the converted image signal into the image signal; a CPU configured to output a user interface for the image signal and an operation control signal according to a handling of the user interface of user; an image processing unit configured to overlap the user interface on the image signal output from the signal processing unit and process the image signal according to the operation control signal.