An information sending method carried out by a base station, comprising: determining a downlink subframe that is used to send first information to user equipment, UE, where the downlink subframe is a first subframe, a second subframe, or a third subframe; and sending the first information to the UE by using the downlink subframe; wherein the first subframe comprises at least two sub-physical resource block pairs, the second subframe comprises at least two physical resource block pairs, and the third subframe comprises at least one sub-physical resource block pair and at least one physical resource block pair; wherein a length of a time domain occupied by the sub-physical resource block pair is less than a length of a time domain occupied by the first subframe, and the sub-physical resource block pair comprises N1 first subcarriers and M1 first orthogonal frequency division multiplexing, OFDM, symbols, wherein a spacing between two adjacent first subcarriers in a frequency domain is greater than a set value, and both N1 and M1 are positive integers; wherein a length of a time domain occupied by the physical resource block pair is equal to a length of a time domain occupied by the second subframe, and the physical resource block pair comprises N2 second subcarriers and M2 second OFDM symbols, wherein a spacing between two adjacent second subcarriers in the frequency domain is equal to the set value, and both N2 and M2 are positive integers, wherein N1 is equal to N2, and M1 is equal to M2; and wherein when the downlink subframe is the third subframe, before the sending of the first information to the UE by using the downlink subframe, the method further comprises: sending a frequency band indication to the UE, wherein the frequency band indication is used to indicate that at least one physical resource block pair occupies a first frequency band, and at least one sub-physical resource block pair occupies a second frequency band, wherein the first frequency band and the second frequency band do not overlap. determining a downlink subframe that is used to send first information to user equipment, UE, where the downlink subframe is a first subframe, a second subframe, or a third subframe; and sending the first information to the UE by using the downlink subframe; wherein the first subframe comprises at least two sub-physical resource block pairs, the second subframe comprises at least two physical resource block pairs, and the third subframe comprises at least one sub-physical resource block pair and at least one physical resource block pair; wherein a length of a time domain occupied by the sub-physical resource block pair is less than a length of a time domain occupied by the first subframe, and the sub-physical resource block pair comprises N1 first subcarriers and M1 first orthogonal frequency division multiplexing, OFDM, symbols, wherein a spacing between two adjacent first subcarriers in a frequency domain is greater than a set value, and both N1 and M1 are positive integers; wherein a length of a time domain occupied by the physical resource block pair is equal to a length of a time domain occupied by the second subframe, and the physical resource block pair comprises N2 second subcarriers and M2 second OFDM symbols, wherein a spacing between two adjacent second subcarriers in the frequency domain is equal to the set value, and both N2 and M2 are positive integers, wherein N1 is equal to N2, and M1 is equal to M2; and wherein when the downlink subframe is the third subframe, before the sending of the first information to the UE by using the downlink subframe, the method further comprises: sending a frequency band indication to the UE, wherein the frequency band indication is used to indicate that at least one physical resource block pair occupies a first frequency band, and at least one sub-physical resource block pair occupies a second frequency band, wherein the first frequency band and the second frequency band do not overlap.