The present invention provides a delivery system for easily collecting/notifying date information about the store/business-opening day, anniversary day, or store/business-closing day of an enterprise, store, organization, etc., and event information about these commemoration days. In the delivery system, a server accepts, from a sponsor-side communication device, date information regarding any of a store/business-opening day and anniversary day, and event information pertaining to the commemoration day. The server calculates anniversary day information for the next and subsequent years on the basis of the date of the store/business-opening day. For the store-opening day registered in the server by a person opening a new store, an anniversary day is registered by the server, and, when the year-round commemoration day of an existing store is registered, the registered day is updated to an anniversary day for the next and subsequent years. The server accepts the transmission of a keyword, etc., from a user-side communication device and searches for a sponsor. The server responds to the user-side communication device with a website for delivering store-closing information or a website for delivering information about an anniversary or a store-opening day in accordance with the presence or absence of the need for updating event information, etc., pertaining to a year-round commemoration day.
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