An image processing result display apparatus that is capable of carrying out smooth scrolling. A scrolling direction that will be designated by an operator is predicted based on image data displayed on an LCD. Image data positioned in the predicted scrolling direction is pre-read from an external storage device. Image data is generated by carrying out predetermined image processing on the pre-read image data and is stored in a main memory. A portion of image data displayable on the LCD is read from the image data stored in the external storage device or in the main memory. If image data positioned in the scrolling direction designated by the operator is stored in the main memory, the image data is read from the main memory, and image data positioned in the scrolling direction designated by the operator is generated based on the read image data, and the generated image data is displayed on the LCD.