To provide a system for improving the rate of successful messaging even on any carrier condition against noise.

Data to be transmitted are encoded and formatted, a check sum (CSM) is determined concerning these encoded and formatted data, this check sum (CSM) is added to an address code word (ADD), and an encoded and formatted message code word is chained to this address code word so that a message can be formed. A receiver is energized and receives transmitted contents in a predetermined frame. In response to the recognition of the address code word, the chained code word is decoded and stored. When each of code words is stored, the check sum is calculated concerning the message and compared with the check sum embedded in the address code word and when these check sums are equal, it is judged that a complete message is received. Then, analysis on the stored message is ended.