Methods for sending and receiving content and system for delivering content through use of e-mail or the like

摘要

An information receiving terminal notifies an information distribution server of a request for delivery of content. This delivery request specifies a category of the content, a delivery validity period and a character string in a subject header of an e-mail to be delivered. The information distribution server selects the content conforming to the delivery request from information provided by an information provision terminal, includes the content in the e-mail and delivers the e-mail to the information receiving terminal. The information receiving terminal classifies the e-mail received by means of the character string in the subject header of the delivered e-mail and a date and time when the e-mail is received. With this classification, the information receiving terminal presents the e-mail including the requested content to a user without fail and deletes a past-due e-mail having declined value of information automatically.