A communication system with a plurality of information processing terminals and an information processing device communicating with the information processing terminals includes a positional information obtaining unit configured to obtain positional information about the information processing terminals; a converting unit configured to convert the positional information obtained by the positional information obtaining unit into alphanumeric information representing a name of a location which corresponds to the positional information; a transmitting unit configured to, when responding to a request from a first information processing terminal of the information processing terminals, transmit to the first information processing terminal the alphanumeric information obtained in conversion by the converting unit from a second information processing terminal of the information processing terminals; and the location with the alphanumeric information transmitted by the transmitting unit.