A presentation data-generating device includes a first part for acquiring document
data sets, each containing contents to be presented, a second part for acquiring
transformation data sets, each defining a transformation rule between the document
data sets and a presentation data set, and, a third part for acquiring layout data
containing layout information that defines a layout of the document data sets.
The device further includes a fourth part for transforming the document data sets
based on the layout data and the transformation data sets to generate a unified
presentation data set that presents contents of the document data sets based on
the layout defined in the layout data.