The invention discloses an information transmission method and apparatus. The method comprises the following steps: setting transmission windows in a scheduling window, wherein one scheduling window comprises K transmission windows, one transmission window comprises P available sub-frames, K is an integer greater than 0, and P is an integer greater than 1; and transmitting information by the available sub-frames in the transmission windows. According to the technical scheme provided by the invention, by adoption of the manner of transmitting information by at least two sub-frames in one transmission window, channel encoding or rate match for system information, such as an SIBI message, is not limited to a single sub-frame anymore, the information transmission method and apparatus are particularly suitable for the transmission of system information of an NB-IOT system as an example, and ensure that the transmission performance of the system information, such as an NB-IOT SIBI message.