Abstract: [PROBLEMS] To provide a low-power-consumption short-range wireless communication system enabling wireless communication devices to perform ad hoc communication without necessitating it to have a server (central device). [MEANS FOR SOLVING PROBLEMS] The inventors have focused on transmission to detect connection destination in the proximity which is performed before establishing connection in low-power-consumption short-range wireless communication systems, e.g. advertisement packets (or scan packets) in the Bluetooth Low Energy communication system. The inventors have designed a mechanism in which various information including an identifier unique to a device is transmitted in attachment to the above packets thereby enabling the devices to perform a high-speed and ad-hoc communication.