Abstract: The present invention relates to technology for generating an ultrasound vector Doppler image using plane wave synthesis, and in a method for generating ultrasound Doppler images, a preset number of plane waves having different incident angles are sequentially and repeatedly transmitted to a target according to a transmission sequence, reflection signals are received from the target at different locations, an ensemble frame is generated by synthesizing, among the received reflection signals, a preset number of reflection signals for each of a positive angle and a negative angle with respect to a reference direction facing the target, and a vector Doppler image generated using a plurality of ensemble frames is output.