In an ultrasonic diagnostic apparatus, a scan converter module generates display frame data from received frame data using a conversation table adapted to the specific display resolution of a display device. Received frame data is stored in a first frame memory, and display frame data is stored in a second frame memory. A control unit selects the conversion table corresponding to the specific display resolution of the display device from among a group of conversion tables. An address converter generates an address set corresponding to a display address using the selected conversion table. Interpolation is then performed based on the echo data specified by this.