1. An ultrasonograph comprising: an ultrasound probe to emit an ultrasound in a plurality of directions against a subject, the plurality of directions including a first measurement direction and a second measurement direction, where the first measurement direction is disposed in a first direction relative to a lateral direction and a propagation direction defined by the ultrasonic probe, and the second measurement direction is disposed in a second direction relative to the lateral direction and the propagation direction, where the second measurement direction is different from the first measurement direction; an ultrasound transmit and receive part to control the ultrasound probe to perform a plurality of transmissions and receptions of the ultrasound in each of the first measurement direction and the second measurement direction; a displacement vector processor configured to: calculate a displacement estimation vector in each of the first measurement direction and the second measurement direction, using a result of the plurality of transmissions and receptions of the ultrasound, and calculate a displacement vector based on the displacement estimation vectors; a strain processor to calculate strain information of the subject based on the displacement vector; an image data generator to create image data based on the calculated strain information; and a display to display an image based on the image data.