There are included a data processing step of selecting two or more pieces of data from among a plurality of pieces of first element data or a plurality of pieces of first reception data generated by subjecting the pieces of first element data to phasing addition processing, and performing superimposition processing on the two or more pieces of data, a region-of-interest setting step of setting a region of interest in an imaging area, and a processing condition changing step of changing a processing condition in the data processing step, in a case where the region of interest is set in the region-of-interest setting step, on the basis of information on the set region of interest.
