1. An ultrasonic image processing apparatus comprising: an in-frame processor which applies a process between a first pixel array and a second pixel array in a frame acquired by transmitting and receiving ultrasound, and which calculates a movement destination on the second pixel array for each pixel of interest in the first pixel array; and a re-constructing unit which re-constructs the second pixel array into a high-density pixel array using the movement destination calculated for each pixel of interest.