The present invention provides a delivery system for easily collecting/notifying a store/business opening day, anniversary day, or store/business closing day of a company, store and other organizations. In the delivery system, a server accepts, from a sponsor-side communication device, date information regarding any of the store/business opening day and the anniversary day, and an event information of the memorial day. The server calculates the information of the anniversary day for the next and subsequent years based on the date of the store/business opening day. For the store opening day registered in the server by a person opening a new store, the anniversary day is registered by the server, and the registered day is updated for the next and subsequent years when the anniversary day of an existing store is registered. The server accepts the transmission of a keyword 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 a store-closing information or a website for delivering information about an anniversary or a store-opening day in accordance with the updating status of the event information of the anniversary day.
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