A resource indication method, characterized by comprising: selecting, by a user equipment, a target mapping relationship from at least two candidate mapping relationships; determining, by the user equipment, a size of a target resource block group according to a size range of a bandwidth part in the target mapping relationship; and allocating, by the user equipment, frequency domain resource according to the size of the target resource block group and first control information sent from a network side; wherein the at least two candidate mapping relationships at least comprise a first mapping relationship and a second mapping relationship; the first mapping relationship is a mapping relationship in which different size ranges of bandwidth parts correspond to different resource block group sizes; the second mapping relationship is a mapping relationship in which at least two different size ranges of bandwidth parts correspond to a same resource block group size, wherein the step of selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships comprises: selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a first configuration signaling sent from the network side, said first configuration signaling comprising capability information of the network side enabling the user equipment to determine which target mapping relationship is to be selected from the at least two candidate mapping relationships; or selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a preset rule. selecting, by a user equipment, a target mapping relationship from at least two candidate mapping relationships; determining, by the user equipment, a size of a target resource block group according to a size range of a bandwidth part in the target mapping relationship; and allocating, by the user equipment, frequency domain resource according to the size of the target resource block group and first control information sent from a network side; wherein the at least two candidate mapping relationships at least comprise a first mapping relationship and a second mapping relationship; the first mapping relationship is a mapping relationship in which different size ranges of bandwidth parts correspond to different resource block group sizes; the second mapping relationship is a mapping relationship in which at least two different size ranges of bandwidth parts correspond to a same resource block group size, wherein the step of selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships comprises: selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a first configuration signaling sent from the network side, said first configuration signaling comprising capability information of the network side enabling the user equipment to determine which target mapping relationship is to be selected from the at least two candidate mapping relationships; or selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a preset rule. selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a first configuration signaling sent from the network side, said first configuration signaling comprising capability information of the network side enabling the user equipment to determine which target mapping relationship is to be selected from the at least two candidate mapping relationships; or selecting, by the user equipment, the target mapping relationship from the at least two candidate mapping relationships according to a preset rule.