There are provided embodiments for providing a vector Doppler image based on decision data. In one embodiment, by way of non-limiting example, an ultrasound system comprises: a processing unit configured to form vector information and additional information of a target object based on ultrasound data corresponding to the target object, wherein set decision data corresponding to the target object based on the additional information, the processing unit being further configured to form a vector Doppler mode image based on the decision data and the vector information.
