An ultrasonic diagnostic apparatus comprises a unit for generating image data, an image reconstructing unit and an image synthesizing unit. The unit for generating image data generates image data for displaying a tomogram of a subject by luminance according to signal intensities of echo signals obtained through ultrasonic waves transmitted to the subject. The image reconstructing unit generates reconstructed images by alternating at least one of a luminance and a color of an area of a predetermined luminance so that the area of the predetermined luminance is emphasized in the image data while the predetermined luminance is altered in turn. The image synthesizing unit supplies the reconstructed images to a display unit so that the reconstructed images are displayed on the display unit in turn.