Board Thread:Naruto Discussions/@comment-3279282-20141007134927/@comment-3279282-20141011234823

SaiST wrote: Seems like it might actually be a Data Book: http://www.narutoforums.com/showpost.php?p=51937921&postcount=77

忍270人 術232個

歴代最大規模で贈る

データブック

集大成！！

忍と術の数は、前作「秘伝・者

の書」の約2倍！！長い間じっく

り楽しめる、大充実の内容だ！！

It basically says that the characters and techniques have doubled since the last databook and that this databook can be enjoyed for a long time because of the large content.