A scanning range for a B-mode image is divided into a plurality of scanning regions, and a division transmission and reception is performed in which transmission and reception for each scanning region and transmission and reception that targets a region of interest for a color flow are alternately repeated. A control unit determines a transmission and reception condition of the division transmission and reception based on required speed information required in a color flow image, and controls the division transmission and reception by a transmission and reception unit in accordance with the determined transmission and reception condition.
