COMMUNICATION TERMINAL, SERVER, AND COMMUNICATION SYSTEM USING THEM

摘要

PROBLEM TO BE SOLVED: To provide a communication system notifying easily a telephone number and a mail address which is already invalid. SOLUTION: A communication terminal 2 selects a telephone number or a mail address to be confirmed their validity according to instruction from a user and creates demand data for demanding to confirm validity. The communication terminal 2 transmits the created demand data to a database server 6 via a communication network. The database server 6 receives the demand data and verifies validity of the telephone number or the mail address according to the demand data and transmits the confirmed result to the communication terminal 2 as result data. The communication terminal 2 receives the result data and inform content of the result data to the user. COPYRIGHT: (C)2004,JPO