The system includes the client end connected to computer network, automatic speech recognition server (ASRS), and database. Through system access telephone number, the client end connects telephone communication network through signal. The database includes registered users' names, information of default receiving telephone (DRT), and speech information of user name. ASRS includes speech recognition module. Client end includes speech synthesis module, user confirmation module, query module and switchover module. The said system is adopted in the method. When receiving dialing from the callingparty, the system requests name of the called user. ASRS accesses the database to identify name of the called user. The client end validates and queries DRT of the name of the called user, and switches the calling telephone to DRT. The invention can convert monotone digit phone number to colorful glaring name. Features: easy to memorize or change phone number, saving roaming cost.