1. Field of the Invention
The present invention relates to a data generation apparatus, a data generation method, and a computer-readable medium in a book generation system that performs bookbinding by bundling a plurality of paper sheets.
2. Description of the Related Art
There is conventionally a system that performs bookbinding by bundling a plurality of paper sheets into a book form and stapling one of the four sides of the book. The book thus generated may include various contents. Hence, a demand has arisen for classifying and laying out the contents in the book or easily visually inspecting classification of the contents included in the book. One of related arts discloses giving additional information to each of a plurality of contents and inserting page breaks by determining the degree of change of details of each content based on the additional information (Japanese Patent Laid-Open No. 2001-5838). There also exists a technique of assigning a thumb index to the fore edge of an output paper sheet in accordance with classification of the content in the page (Japanese Patent Laid-Open No. 2002-8049).
In the above-described technical literatures, pages are partitioned based on content classification, or content classification in a book can be visualized by assigning a thumb index to each page. However, the thumb indices are always assigned even if the effect is small or absent from the viewpoint of visualization because the content composition of the book is not taken into consideration. For example, when determining content classification in a book by thumb indices, the effect is small if the book includes few pages. If the number of classifications is large, thumb index assignment may be redundant. When the grammage of paper sheets is large, the classification cannot be identified from the fore edge side even if thumb indices are assigned. The above-described technical literatures do not deal with these problems.