1. A display apparatus comprising: a display panel: a user input switch for inputting a first switching instruction, and for inputting a second switching instruction from the user; and a processor configured to perform: a step of managing a display order of image data files and associated text data; a step of displaying a plurality of the image data files on the display panel; a step of selecting text data to be displayed, the text data corresponding to image data from a selected one of the image data files; a first shifting step of shifting the display of the plurality of the image data files to a display of the selected text data responsive to the first switching instruction; a second shifting step of, responsive to the second switching instruction, shifting the display of currently displayed text data to a simultaneous display of 1) an image corresponding to the displayed text data and 2) an image string representing a plurality of the image data files which follow the image corresponding to the displayed text data in the display order; a step of continuously and automatically switching the displayed text data in the display order during an interval from the first shifting step responsive to the first switching instruction to the second shifting step responsive to the second switching instruction.