Provided is an endoscopy system including: an image signal generator connected to one side of a cable, including a signal transmitter for amplifying and transmitting an image signal so as to transmit the image signal of inner body through the cable; a signal processor connected the other side of the cable, for damping and receiving the image signal which is transmitted through the cable; a central processing unit for outputting an operation control signal to perform an user interface for the image signal; and an image processing unit for overlapping the user interface into the image signal outputted from the signal processor and for processing the image signal in accordance with the operation control signal.