Communication system wherein a wireless repeater device sends notifications to wireless LAN terminals

摘要

The system has a wireless communication unit to wirelessly communicate with a wireless LAN terminal (513), and another communication unit to communicate with a public wireless communication network. A detection unit detects a connection state of the network. A control section (5121) controls transmission of a connection state information to the terminal. A notification unit notifies the information to the user. The wireless LAN terminal has a third wireless communication unit to communicate with a wireless communication apparatus. Independent claims are also included for the following: (a) a method of authentication for specifying a device which is the object of communication (b) a traffic management system with management center having a management unit for maintaining traffic states of a set of vehicles.