Communication system, communication terminal, server, communication method, recording medium, information query method and information specifying method

摘要

A communication system includes a plurality of communication terminals and a server. The plurality of communication terminals perform wireless communication therebetween by a predetermined communication protocol. The server is to be connected with the plurality of communication terminals through a predetermined communication line. The plurality of communication terminals each include a first receiving section which receives identification information sent from another communication terminal for identifying the another communication terminal and a first sending section which sends to the server through the predetermined communication line the identification information received by the first receiving section. The server includes a second receiving section which receives the identification information sent from the communication terminal and a specifying section which specifies, among the plurality of communication terminals, the communication terminal whose identification information has not been received based on the identification information received by the second receiving section.