Smooth, stable and high quality game image is provided by accurately pre-reading
background data required for image processing each time. The game device therefore
reads background data required for a game that displays a condition of a moving
vehicle within a virtual three-dimensional space together with a background in
the main memory from a CD-ROM (recording medium) prior to image processing. This
device comprises a pre-reading unit for pre-reading background data from a recording
medium when reading a start line (reference line) set at a distant position in
a specified distance away from the limit line of the visual field direction of
display is crossing a new area. A recording medium is a medium that records background
data by dividing it into a plurality of areas in advance, and the pre-reading unit
comprises a unit for judging on which of the areas the reference line is crossing,
and a reading unit for reading in memory the background data of the area judged
as being crossed with the reference line.