A page replacement method is provided. The page replacement method includes (a) establishing a first page list in which a plurality of pages in a main memory are listed in an order that they have been used, (b) establishing a second page list in which some of the pages in the main memory whose images are stored in a storage medium are listed in an order that they have been used, and (c) storing data downloaded from the storage medium in the pages included in the second page list in an order opposite to the order that the corresponding pages are listed in the second page list.
