E-BOOK ADVERTISEMENT SYSTEM, E-BOOK ADVERTISEMENT METHOD, CLIENT DEVICE, ADVERTISEMENT-PROVISION DEVICE, PROGRAM, INFORMATION-RECORDING MEDIUM, AND E-BOOK UPDATE SYSTEM

摘要

In order to update advertisements inside an e-book on the basis of content that the user has viewed and paid attention to in said electronic book, a client device (10): acquires an e-book that contains body-text pages and advertisement pages; displays, on a touch panel (12), at least some of the pages in said e-book; changes the page(s) displayed on the touch panel (12) when a page-switch request is received from the user; magnifies and displays a specified part of a page displayed on the touch panel (12) when a page-magnification request is received from the user; and updates the advertisement pages on the basis of advertisement data associated with an advertisement subject selected from advertisement subjects determined in advance for pages and magnification regions acquired on the basis of a history of pages and magnification regions displayed on the touch panel (12).