According to one embodiment, an ultrasonic diagnostic apparatus comprises an ultrasonic probe, a scanning unit, an image data generating unit, a slice specifying unit, an image generating unit and a display unit. The scanning unit repeats three-dimensional scanning on a three-dimensional region in an object with an ultrasonic wave via the ultrasonic probe. The image data generating unit repeatedly generates three-dimensional image data based on an output from the scanning unit. The slice specifying unit specifies at least one slice from the three-dimensional image data concurrently with the three-dimensional scanning. The image generating unit generates at least one slice image associated with the specified slice from the three-dimensional image data. The display unit displays the generated slice image.
