There is provided an ultrasound image picking-up device that can correct a positional shift from a reference image before therapy even with insufficient clarity of an ultrasound image. An image processing system includes a position recognition device 1 for recognizing a position to be recognized of an object; a cross sectional image processor 6 that computes cross sectional image data of the object including position information of the position to be recognized; a probe 2 that transmits and receives ultrasound to the object; a ultrasonic image processor 3 that computes a plurality of ultrasound image data based on the ultrasound received by the probe 2; an image selector 7 that selects ultrasound image data including the area to be recognized from the plurality of ultrasound image data; an image processor 4 that aligns, in the area to be recognized, the cross sectional image data with the ultrasound image data including the area to be recognized; and a display 5 that displays a processing result of the image processor.