Abstract: A signal transmitted from an information service carrier is received b an antenna, and tuned and detected by an RF unit. The detected signal is demodulated and then supplied to a decoder unit. It is judged whether a distinction ID code coincides with the own ID code stored in an ID-ROM or not. If the codes coincide with each other, message information is obtained from a signal which is subsequently received, and an interrupt signal indicative of reception of an effective signal is outputted. In response to the interrupt signal, a control unit actives operation programs which are previously stored in a program memory. The received message information is temporarily stored in a temporary message storage buffer. A received message containing a keyword which is previously stored in a keyword storing unit is selected, and then stored in a received message storing unit.