1. An analytical data display processing device for creating graphs including chromatograms or spectrums based on analytical data collected by sample analysis and performing processing to display one or a plurality of graphs by assigning the graphs to each of a plurality of display regions set within a display screen, the device comprising: a processor; and a computer-readable medium storing software instructions that, when executed by the processor, cause the processor to: a) store, in a display layout information storage, a plurality of display layouts, each display layout defined at least by settings of a plurality of display regions within the display screen, assignment of types of graphs displayed in each of the display regions, and a display format of the graphs assigned to each of the display regions, wherein the types of graphs include chromatograms or spectrums; b) provide a list display of thumbnail images corresponding to the plurality of display layouts in a display region differing from the display regions where the graphs are assigned within the display screen, wherein each thumbnail image comprises an image of a state in which graphs are displayed in accordance with a corresponding display layout; c) allow an analyzer to select and indicate one of the displayed thumbnail images; and d) when one thumbnail image is selected and indicated, construct, display, and output a display screen on which the graphs created based on designated analytical data are arranged in accordance with a display layout corresponding to the selected and indicated thumbnail image.