To make the objective page in a booklet easy to be opened.

A tab mark 51 and a page mark 52 are printed on the edge part of the small-opening side 42 in the booklet 40. The tab mark 51 is the mark, when the written contents of the booklet 40 are divided into a plurality of sections by the beforehand defined classification method, showing whether each page belongs to which section. The page mark 52 is the mark showing a page range obtained by dividing the booklet 40 by a beforehand decided page unit. Further, a category image 53 including the identification information of the section showing correspondence between the tab mark 51 and the section and the identification information in a page range showing the correspondence between the page mark 52 and the page range is printed on the edge part of the small-opening side 42 of the page which opened the index part.