To provide a portable terminal device or the like allowing a user to easily perform editing, and in which the total data volume of obtained document is not too large, an unnecessary gap is not generated in the explanation, and effect of the explanation to a counterpart such as a client of the user does not degrade.SOLUTION: A portable terminal device 20 includes a display unit 21. In the portable terminal device, slide information to be displayed includes a plurality of pieces of slide information independently stored for each one screen, the pieces of slide information can be arbitrarily combined, the slide information includes main explanation slide information to be used for main explanation, related slide information being information related to the main explanation slide information, and the slide information can be stored in association with the main explanation slide information, and the main explanation slide information associated with the related slide information is displayed on the display unit with transition of one screen from the related slide information.SELECTED DRAWING: Figure 6
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