A display processing apparatus comprises a controller configured to perform a first classification processing to classify a plurality of image files stored in a storage medium into a plurality of primary categories. The controller is further configured to perform a second classification processing to classify the plurality of image files into a plurality of secondary categories when it is judged that the number of the plurality of primary categories is greater than a maximum-displaying number. At least one of the plurality of secondary categories contains at least two of the plurality of primary categories. A plurality of primary-categorizing icons are displayed when the number of the plurality of secondary categories is equal to or less than the maximum-displaying number.