1. An ultrasonic image processor comprising: a storage unit for storing a plurality of ultrasonic data acquired at a plurality of time phases of a heart of a sample; a motion field setting unit for setting a motion field defining a motion direction of the heart for the plurality of ultrasonic data; a contraction center setting unit for setting a contraction center of the heart for the plurality of ultrasonic data; a first distribution image generating unit for generating a first distribution image of a motion velocity in the motion direction defined by the motion field every time phase on the basis of the plurality of ultrasonic data; a first estimation unit for estimating a translation motion component of the heart based on the contraction center of the heart at at least two continuous time phases; a second distribution image generating unit for generating a second distribution image every time phase by correcting the plurality of first distribution images on the basis of the translation motion component; a tracking point setting unit for setting a plurality of tracking points existing in a tissue region of the sample on a second distribution image at a predetermined time phase among the plurality of second distribution images; a second estimation unit for estimating corresponding points corresponding to the plurality of tracking points at each time phase on the basis of velocities of the plurality of tracking points and time intervals between the plurality of time phases in the plurality of second distribution images corresponding to the other time phases other than the predetermined time phase; a signal value determining unit for determining signal values of the tracking points and the corresponding points on the basis of the second distribution image at each time phase; a motion information image generating unit for generating a motion information image on the basis of the signal values of the tracking points and the corresponding points; and a display unit for displaying the motion information image.