An endoscopy system includes: an image signal generating unit which is connected to one side of a cable, and which includes a signal transmission unit for converting an image signal of inner body according to a protocol for long distance transmission and transmit a converted image signal to thereby send the image signal through a cable； a signal processing unit which is connected to the other side of the cable, and which receives the converted image signal transmitted through the cable and converts the converted image signal into the image signal； a CPU for outputting 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 for overlapping the user interface on the image signal output from the signal processing unit and processing the image signal according to the operation control signal.
