An ultrasound diagnosis apparatus comprising: an ultrasound probe configured to transmit an ultrasound signal to an object and receive an ultrasound echo signal returned from the object; a controller configured to determine a velocity of the object based on the ultrasound echo signal; a display configured to display a spectral Doppler image showing velocities of the object over time and configured to display a user interface for setting a velocity interval selected by a user; a user input unit configured to receive, using the user interface, user inputs of selecting an interval within a range of the velocities of the object shown in the spectral Doppler image, and user inputs of adjusting an output volume of an audible sound corresponding to velocities in the selected interval; and an audio output unit configured to output, based on the adjusted output volume of the audible sound, an audible sound representing the velocities of the object over time, wherein the controller is further configured to control the display to display an image showing a distribution of the velocities of the object in the selected interval, wherein the user input unit is further configured to receive a user input of further selecting a sub velocity interval in the image, and to receive a user input of adjusting a sound volume with respect to the sub velocity interval, wherein the ultrasound diagnosis apparatus is configured to adjust the output volume of an audible sound corresponding to velocities in the selected interval; wherein the ultrasound diagnosis apparatus is further configured to output an audible sound representing the entire velocity of the object over time based on the adjusted sound volume. an ultrasound probe configured to transmit an ultrasound signal to an object and receive an ultrasound echo signal returned from the object; a controller configured to determine a velocity of the object based on the ultrasound echo signal; a display configured to display a spectral Doppler image showing velocities of the object over time and configured to display a user interface for setting a velocity interval selected by a user; a user input unit configured to receive, using the user interface, user inputs of selecting an interval within a range of the velocities of the object shown in the spectral Doppler image, and user inputs of adjusting an output volume of an audible sound corresponding to velocities in the selected interval; and an audio output unit configured to output, based on the adjusted output volume of the audible sound, an audible sound representing the velocities of the object over time, wherein the controller is further configured to control the display to display an image showing a distribution of the velocities of the object in the selected interval, wherein the user input unit is further configured to receive a user input of further selecting a sub velocity interval in the image, and to receive a user input of adjusting a sound volume with respect to the sub velocity interval, wherein the ultrasound diagnosis apparatus is configured to adjust the output volume of an audible sound corresponding to velocities in the selected interval; wherein the ultrasound diagnosis apparatus is further configured to output an audible sound representing the entire velocity of the object over time based on the adjusted sound volume.