Disclosed is an ultrasound apparatus and method for controlling the same, whereby once a feature point for re-registration is selected on one of registered ultrasound image and external image, a cursor is displayed on the other image at a point corresponding to the selected feature point. The ultrasonic apparatus includes a controller for using a difference in coordinates between a first feature point of an ultrasound image and a second feature point of an external image with respect to a reference coordinate system, to register the ultrasound image and the external image； a display for displaying the registered ultrasound image and external image； and an input unit for receiving a command to select third and fourth feature points for re-registration, wherein the controller is configured to, once the third feature point of one of the ultrasound image and the external image is selected, control the display to display a cursor for selection of the fourth feature point at a position corresponding to the third feature point on the other one of the ultrasound image and the external image by means of the difference.
