1. An ultrasonic diagnostic apparatus comprising: a memory which stores a plurality of ultrasonic images which corresponds to a plurality of time phases and are concerning with an object; a distribution image generation unit configured to generate a plurality of distribution images of motion velocities in the plurality of the time phases on the basis of the plurality of the ultrasonic images; a tracking point setting unit configured to set tracking points in a tissue range of the object in an image which is one of the plurality of ultrasonic images and corresponds to a predetermined time phase; an estimation unit configured to estimate corresponding points which correspond to the tracking points in the plurality of ultrasound images corresponding to remaining time phases other than the predetermined time phase, on the basis of the plurality of distribution images of motion velocities; a signal value determining unit configured to determine signal values at the tracking points and the corresponding points in each of the plurality of the time phases according to stretch of the tissue range of the object; a motion information image generating unit configured to generate a motion information image on the basis of the signal values at the tracking points and the corresponding points; and a display unit configured to display the motion information image.