To judge a page number of an objective page even when page information on the objective page can not be read out.

A book handling apparatus reads a page mark on a surface of a bankbook by a reader (step S3), opens a two-page spread before or after the preset number of pages from the present opened page (step S5) when the reading is not correctly executed (N of step S4), and reads the page mark 55 of the opened page (step S6). The apparatus then again opens the original page (step S9), and estimates which page the object page opened in the step S9 is (step S10) from the read result of the step S6.