A communication system to which a method for charging a user based on the fact that the user got advertisement information from a base station and dropped in at a shop associated with the advertisement information can be applied and a method for calculating an advertisement fee. A server system has a...http://www.google.com.au/patents/US20060242022?utm_source=gb-gplus-sharePatent US20060242022 - Communication apparatus and communication system and method for calculating advertisement rates
