System information transmitting method, receiving method, transmitting device and receiving device

The invention provides a system information transmitting method, a receiving method, a transmitting device and a receiving device. The system information transmitting method comprises steps: the system information for being transmitted to a terminal is determined; and the above system information is transmitted in one or more predetermined narrowband positions. Thus, the transmitting mode problem of downlink control information independently carrying system message change information, ETWS (Earthquake and Tsunami Warning System), CMAS (Commercial Mobile Alert Service) and the like in a related technology can be solved, and effects of efficient transmission are achieved; and the problem of high complexity when the terminal blindly detects the downlink control information carrying the system message in the related technology can be solved, and the effects of reducing the complexity when the terminal blindly detects the system message are further achieved.