A storage unit is configured to store a document to be displayed in a predetermined display area on a display. An instruction acknowledging unit is configured to receive a scroll instruction signal for scrolling the document displayed in the display area. A range identifying unit is configured to identify a previously displayed block displayed in the display area before the scrolling operation and a subsequently displayed block displayed in the display area as updated by the scrolling operation. A delay control unit is configured to cause the previously displayed block to be scrolled in the display area by the predetermined amount of movement and displayed accordingly, and causing the subsequently displayed block to be scrolled and displayed accordingly with a delay from the previously displayed block.