An ultrasonic imaging apparatus comprising: an image processor configured to extract a target in an object based on volume data of the object; a controller configured to determine a region of interest in the object, based on the extracted target; and a display unit configured to successively display a plurality of slice images of the object, including the region of interest, wherein the display unit is further configured to successively display the plurality of slice images of the object according to a predetermined distance between two successive slice images of the object and a predetermined frame rate, wherein the display unit is further configured to successively display a plurality of slice images of the object for an entire section of the object, the entire section of the object decided by the volume data of the object, if a slice image being currently displayed includes the region of interest, the display unit is configured to stop successively displaying the plurality of slice images of the object for the entire section of the object, and after stopping successively displaying the plurality of slice images of the object for the entire section of the object, the display unit is configured to successively display a plurality of slice images of the object for a section of interest which is decided by the region of interest and which is based on boundary lines of the region of interest, wherein the display unit further is configured to successively display a plurality of first slice images of the object, including the region of interest, wherein the plurality of first slice images are perpendicular to a predetermined first direction, wherein the display unit is configured to mark a position of a first slice image being currently displayed, in a second slice image of the object, wherein the second slice image of the object is perpendicular to a second direction being perpendicular to the first direction, and wherein the display unit is configured to mark the position of the first slice image being currently displayed, in a third slice image of the object, wherein the third slice image of the object is perpendicular to a third direction being perpendicular to the first direction and the second direction. a controller configured to determine a region of interest in the object, based on the extracted target; and a display unit configured to successively display a plurality of slice images of the object, including the region of interest, wherein the display unit is further configured to successively display the plurality of slice images of the object according to a predetermined distance between two successive slice images of the object and a predetermined frame rate, wherein the display unit is further configured to successively display a plurality of slice images of the object for an entire section of the object, the entire section of the object decided by the volume data of the object, if a slice image being currently displayed includes the region of interest, the display unit is configured to stop successively displaying the plurality of slice images of the object for the entire section of the object, and after stopping successively displaying the plurality of slice images of the object for the entire section of the object, the display unit is configured to successively display a plurality of slice images of the object for a section of interest which is decided by the region of interest and which is based on boundary lines of the region of interest, wherein the display unit further is configured to successively display a plurality of first slice images of the object, including the region of interest, wherein the plurality of first slice images are perpendicular to a predetermined first direction, wherein the display unit is configured to mark a position of a first slice image being currently displayed, in a second slice image of the object, wherein the second slice image of the object is perpendicular to a second direction being perpendicular to the first direction, and wherein the display unit is configured to mark the position of the first slice image being currently displayed, in a third slice image of the object, wherein the third slice image of the object is perpendicular to a third direction being perpendicular to the first direction and the second direction.