An ultrasound imaging apparatus includes an ultrasound transceiver configured to transmit an ultrasound signal to an object and receive an ultrasound echo signal reflected from the object, based on a beamforming parameter of the ultrasound imaging apparatus and an image processor configured to generate scanning lines forming a frame based on the received ultrasound echo signal, generate sub-frames by sorting the scanning lines into respective groups having the scanning lines with similar properties, based on the beamforming parameter, perform image-processing of the generated sub-frames, and recombine the scanning lines from the image-processed sub-frames to generate an ultrasound medical image corresponding to the frame.
