COMMUNICATION TERMINAL

This invention relates to a communication terminal device such as a personal handyphone system or a portable telephone. A combination of CS-ID group and corresponding position information (character series) may be stored in a memory means in advance. In the standby mode, CS-ID group comprising CS-ID concerning control channels whose receive signal strength indicate (RSSI) may fall within the high-order predetermined number may be obtained from CS-ID which may be sequentially received by search operations executed at every constant time and which may be stored in a RAM. If an incoming call is an incoming call concerning a designated caller telephone number and a code which agrees with an information notice code is located at an incoming sub-address (ST29), then the number of coincident CS-ID in each of a plurality of combinations may be checked by comparing CS-ID groups stored in the RAM and CS-ID groups of each of a plurality of combinations stored in the memory means, and position information comprising a combination having the maximum number of coincident base station identification information may be obtained (ST30). Such position information (indicating the position of terminal device) may be transmitted to the caller side (monitor side) (ST32), whereby the caller side can easily recognize the position of the terminal body.