In order to update advertisements insidean e-book on the basis of content that the user has viewedand paid attention to in said electronic book, a client device(10): acquires an e-book that contains body-textpages and advertisement pages; displays, on a touch panel(12), at least some of the pages in said e-book; changesthe page(s) displayed on the touch panel (12) when apage-switch request is received from the user; magnifiesand displays a specified part of a page displayed on thetouch panel (12) when a page-magnification request is receivedfrom the user; and updates the advertisement pageson the basis of advertisement data associated with an advertisementdetermined in advance for pages and magnification regions acquired on te basisof a history of pages and magnification regions displayed on the touch panel (12).subject selected from advertisement subjectsacquired on the basis of a history of pages and magnificationregions displayed on the touch panel (12).
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