Abstract: A master interface for a surgical robot, mounted on a master robot for controlling a slave robot, may include two or more robot arms each having a mounted surgical instrument. The master interface may include: a screen display unit configured to display an on-screen image corresponding to a picture signal inputted from a surgical endoscope; two or more arm manipulation units equipped for controlling the two or more robot arms, respectively; and a control unit configured to provide control such that the on-screen image is rotated or mirrored in a pre-designated direction according to a user manipulation, and configured to provide control such that control conditions for the robot arm are renewed to match the rotated or mirrored on-screen image. Thus, the display screen on a surgical monitor can be suitably controlled according to the intent of the surgeon, to remove the non-intuitiveness of a surgical procedure.