1. An ultrasonic diagnostic apparatus comprising: a data generating unit that generates first ultrasonic image data by executing transmission and reception of an ultrasonic wave with respect to a predetermined region of a tested body in a Doppler mode; a detection unit that detects a boundary region between a blood flow region and a tissue region and a peripheral region, which is a region in the neighborhood, by using the first ultrasonic image data; and a correction unit that executes image correction processing at each position of the peripheral region of the first ultrasonic image data by blending the first ultrasonic image data and second ultrasonic image data, which is obtained by executing smoothing processing on the first ultrasonic image data, in a predetermined ratio.