1. An ultrasonic diagnosis apparatus comprising ultrasonic-image creation means for reconstructing an ultrasonic image on the basis of a reflection echo signal measured by means of an ultrasonic probe which transmits ultrasonic waves to a subject and receives the ultrasonic waves from the subject; holding means for holding data of images of the subject captured in advance; reference-image creation means for extracting, from the captured-image data held in the holding means, a reference image corresponding to a sectional position of the ultrasonic image; and display means for displaying the ultrasonic image and the reference image, the ultrasonic diagnosis apparatus being characterized in that the holding means holds the captured-image data with time phase information attached thereto; and the reference-image creation means extracts the reference image on the basis of the captured-image data corresponding to the time of capture of the ultrasonic image.