Provided is an ultrasound system and an image display method of displaying an ultrasound image on an auxiliary display. The ultrasound system generates a three-dimensional (3D) image in a first orientation with respect to ultrasound volume data acquired from an object and displays the 3D image in the first orientation on a display. The ultrasound system also acquires position information and orientation information of an auxiliary display and determines a second orientation based on the acquired position information and orientation information. The ultrasound system then generates a 3D image in the determined second orientation and controls the 3D image in the second orientation to be displayed on the auxiliary display.
