According to one embodiment, an ultrasonic diagnostic apparatus comprises a data acquisition unit configured to ultrasonically scan a three-dimensional area including a predetermined region of an object and acquire volume data associated with the three-dimensional area, a calculation unit configured to cut the volume data at at least one plane and calculate a full-scale contour of a slice of the predetermined region and a full-scale planned surgical line used for surgical operation of the predetermined region, and an output unit configured to output at least one of the full-scale contour of the slice of the predetermined region and the full-scale planned surgical line.
