A method of providing a motion vector is disclosed. The method according to embodiments of the present disclosure comprises: acquiring ultrasound data corresponding to a region of interest within a brightness mode (B-mode) image of a target object; forming a color Doppler mode image of the target object based on the ultrasound data; forming a motion vector of the target object based on the ultrasound data and the color Doppler mode image; and setting the motion vector on the color Doppler mode image.