An endoscope apparatus includes an image signal transmitting unit configured to perform a pre-emphasis for the image signal according to preset first gain information or second gain information, and generate a first pre-emphasis signal or a second pre-emphasis signal, a signal transmitter configured to include a first transmission line for transmitting the first pre-emphasis signal and a second transmission line for transmitting the second pre-emphasis signal； an image signal receiving unit configured to perform an equalizing operation according to preset second correction information for the second pre-emphasis signal transmitted through the second transmission line.
