To provide an advertisement information providing method which can increase the frequency of access to an advertisement information supply server and supply advertisement information timely to a client side.

An accessory screen 6 of a timer a calendar, etc., having a display area for advertisement information provided by an advertiser is displayed on a terminal device 2 installed by incorporating a pair of advertisement information and address information selected from an advertisement provision list 4 where advertisement information and address information on the advertisement information supply server 3 storing the advertisement information are related to the advertiser, and software capable of accessing the advertisement information supply server 3 according to the address information is distributed by a proper means, and the advertisement information displayed on the terminal device 2 at a request from the terminal device 2 having the software installed is updated into the latest advertisement information on the advertisement information supply server 3.