A method of data display for a system which includes a main image memory having stored therein data representing a main image, a display memory coupled to temporarily hold data transferred thereto form the main image memory, and a display apparatus for displaying at least a selected portion of the data held in the display memory, whereby while scrolling is being executed in the horizontal or vertical display direction, new data are transferred from the main image memory to the display memory only when the limits of the data currently held in the display memory are exceeded, and with only data for one display line or column being transferred in such a case.