An ultrasound diagnostic system for displaying an enhanced Doppler spectrum image. The ultrasound diagnostic system includes: a period setting unit operable to set a period for computing spectral Doppler components from ultrasound data obtained by transmitting/receiving ultrasound signals to/from a target object a Doppler spectrum data acquiring unit operable to compute the spectral Doppler components at the set period from the ultrasound data for acquiring Doppler spectrum data a storage unit operable to store the acquired Doppler spectrum data a user input unit operable to receive sweep speed information from a user for selecting a sweep speed a data adjusting unit operable to compare the set period with the selected sweep speed and adjust the Doppler spectrum data based ON the comparison result and a display unit operable to display a Doppler spectrum image based ON the adjusted Doppler spectrum data.
