While making it possible to register generation information used to generate a Web page for each topic by sending element information being components of the Web page by an email and add element information to the generation information by an email, it is made difficult for persons other than a person who registered the generation information to add the element information. When a receiver address included in a received email is a first address, an information registration apparatus registers generation information included in the email and transmits an email including a unique second address corresponding to the generation information to a sender of the received email, and when the receiver address is a second address and the receiver address is not the same as receiver addresses included in emails received before, the information registration apparatus adds element information to the generation information corresponding to the receiver address included in the currently received email.
