1. An ultrasonograph comprising: an ultrasound probe to emit an ultrasound in a plurality of mutually crossing directions against a subject; 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 plurality of directions; a displacement vector processor to calculate a displacement vector in each of the plurality of directions from a result of the plurality of transmissions and receptions of the ultrasound; a strain processor to calculate strain information of the subject based on the displacement vectors; 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.