An ultrasound apparatus includes a probe to acquire ultrasound data from an object; a communicator; a display; and a processor to generate a first ultrasound image based on the ultrasound data; display the first ultrasound image on the display; control the communicator to transmit the first ultrasound image to an external device so that the first ultrasound image is displayed on the external device; generate a second ultrasound image based on the ultrasound data and a control command received from the external device, the control command being based on a touch input with respect to the first ultrasound image displayed on the external device; display the second ultrasound image on the display; and control the communicator to transmit the second ultrasound image to the external device so that the second ultrasound image is displayed on the external device.