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) a layout information storage that stores information regarding the display layout defining at least the settings of a plurality of display regions within the display screen, the assignment of graphs displayed in each of the display regions, and the display format of graphs assigned to each of the display regions; b) a layout thumbnail presenting module that provides a list display of thumbnail images showing images of the display layout stored in the layout information storage in a display region differing from the display regions where the graphs are assigned within the display screen; c) a selection and indication module that allows an analyzer to select and indicate one of the thumbnail images displayed by the layout thumbnail presenting unit; and d) a display processing module which, when one thumbnail image is selected by the selection and indication means, constructs, displays, and outputs a display screen on which a graph created based on designated analytical data is arranged in accordance with the regulations of the display layout stored in the layout information storage so as to correspond to the thumbnail image.