A communication system includes a communication terminal, a computer transmitting addressee identification information to the communication terminal, a computer-side fetching unit fetching the addressee identification information from a computer-side store unit, a computer-side output unit that outputs the fetched addressee identification information to the terminal in case of communication, a retrieval information input unit located in the terminal and operated for input of retrieval information relating the addressee identification information, an instruction unit located in the terminal to instruct the computer to retrieve the addressee identification information, the instruction unit instructing the computer to fetch the addressee identification information based on the retrieval information supplied by an operator, and a terminal side display that displays the outputted data so that the desired addressee identification information is selected at the terminal side.