In a system, a first closed region specifying unit specifies a first closed region on a screen for enclosing an imaged obstacle in a first image, and a first projection area determining unit determines a first virtual projection area by extending a first closed region in a first orientation. A second closed region specifying unit specifies a second closed region on the screen. The second closed region encloses the imaged obstacle in the second image. A second projection area determining unit determines a second virtual projection area by extending the second closed region in a second orientation. An establishing unit establishes an overlap region between the first and second projection areas as the no-entry zone for the robot.