the cache 280 display memory and display cache buffer not shown are is searched for the required tile images in step 352 if the needed tile images are not found in the cache 280 including display memory and display cache buffer they are requested directly from the storage 142 fig1 in step 354 the tile images received from the storage 142 may be decompressed in step 356 prior to their assignment to the mosaic view in step 358 if the required tile images are found in the cache in step 352 they are removed from the cache in step 260 and the total number of tile images in the cache is decremented by 1 step 362 with each tile image removed as each tile image is removed from cache it is assigned to the mosaic view in step 358 following assignment of tile images to the mosaic view the mosaic view is refreshed in step 364 and the mosaic view panning process ends in step 366 fig6 is a flow diagram showing a process by which a mosaic view is resized in accordance with an exemplary embodiment of the invention the mosaic view resizing process is started in step 320 the mosaic view resizing process determines in step 370 whether the mosaic view was enlarged if the mosaic view was minimized a determination of tile images to be excluded from display is performed in step 372 the excluded tile images are removed from the mosaic view in step 374 and are added to the cache in step 376 the total number of tile images in the cache is increased by 1 with each tile image added in step 378 if the mosaic view was found in.