Abstract: A sensing device senses a frame of a data link layer transmitted from the wireless LAN interface of a mobile phone without establishing connection with the mobile phone, detects equipment identification information of the mobile phone from the frame, and transmits the detected equipment identification information to a server device. The server device then selects delivery data based on identification information of the sensing device that has detected the equipment identifier, and transmits the selected delivery data via a mobile phone network to the mobile phone corresponding to the equipment identification information.