Provided are an information sending method and apparatus, a terminal, an access network device and a system, which relate to the field of communications. The method comprises: an access network device determines a first frequency domain resource pattern among K frequency domain resource patterns, each frequency domain resource pattern corresponding to at least one frequency domain resource; the access network device sends downlink control information to a terminal, the downlink control information being used for indicating an index of the first frequency domain resource pattern, the frequency domain resource corresponding to the first frequency domain resource pattern being used for transmitting service data of the terminal. The K frequency domain resource patterns are provided in advance, and when it is necessary for the access network device to allocate the one or more resources corresponding to the frequency domain resource pattern to the terminal, the downlink control information requires only a very few bits to indicate the index of the first frequency domain resource pattern, thereby enabling the size of the downlink control information to be relatively small, increasing the transmission reliability and transmission efficiency of the downlink control information, and reducing the number of retransmissions.