Trackball module, ultrasonic image processing apparatus using trackball module and method of controlling ultrasonic image processing apparatus using trackball module

An ultrasonic image processing apparatus includes a trackball module configured to receive a control command from a user, and a controller configured to generate a control command for the trackball module and transfers the generated control signal to the trackball module. The trackball module includes a trackball configured to receive a control command from a user, and a lighting device. The lighting device includes a light source, an optical passage bent at least once to provide an optical path through which light emitted from the light source passes while being reflected at least once, and a light exit opening defined at one end of the optical passage from which light passing through the optical passage is emitted to an outside of the lighting device. The light exit opening is defined around the trackball.