When an information providing server 20 according to the present invention acquires attribute information items of RFID tags 51 to 59 detected in a shopping cart and in the vicinity thereof, it transmits these attribute information items to a rule server 30. When the received attribute information items satisfy a predetermined combination, the rule server 30 returns presentation information corresponding to the combination to the information providing server 20. When the information providing server 20 receives this presentation information, it sends the presentation information to a mail address of mobile equipment 70 acquired from the attribute information items. This permits the user to readily figure out a dish that can be made from cooking ingredients put in the cart.