A downlink control information transmission method, comprising: receiving, by a terminal device, configuration information sent by a network device through higher layer signaling; receiving, by the terminal device, a first Downlink Control Information, DCI, sent by the network device; and parsing, by the terminal device, the first DCI according to a DCI format of the first DCI and the configuration information, wherein the configuration information corresponds to the DCI format; wherein the step of parsing, by the terminal device, the first DCI according to the DCI format of the first DCI and the configuration information comprises: if the DCI format of the first DCI belongs to a compact DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to a value of a field in the first DCI and a first frequency domain resource granularity which corresponds to a compact DCI format and is comprised in the configuration information; or if the DCI format of the first DCI belongs to a regular DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to the value of the field in the first DCI and a second frequency domain resource granularity which corresponds to a regular DCI format; wherein a frequency domain granularity indicated by the first frequency domain resource granularity is greater than the second frequency domain resource granularity. receiving, by a terminal device, configuration information sent by a network device through higher layer signaling; receiving, by the terminal device, a first Downlink Control Information, DCI, sent by the network device; and parsing, by the terminal device, the first DCI according to a DCI format of the first DCI and the configuration information, wherein the configuration information corresponds to the DCI format; wherein the step of parsing, by the terminal device, the first DCI according to the DCI format of the first DCI and the configuration information comprises: if the DCI format of the first DCI belongs to a compact DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to a value of a field in the first DCI and a first frequency domain resource granularity which corresponds to a compact DCI format and is comprised in the configuration information; or if the DCI format of the first DCI belongs to a regular DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to the value of the field in the first DCI and a second frequency domain resource granularity which corresponds to a regular DCI format; wherein a frequency domain granularity indicated by the first frequency domain resource granularity is greater than the second frequency domain resource granularity. if the DCI format of the first DCI belongs to a compact DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to a value of a field in the first DCI and a first frequency domain resource granularity which corresponds to a compact DCI format and is comprised in the configuration information; or if the DCI format of the first DCI belongs to a regular DCI format, determining, by the terminal device, a frequency domain resource of data transmission scheduled by the first DCI according to the value of the field in the first DCI and a second frequency domain resource granularity which corresponds to a regular DCI format; wherein a frequency domain granularity indicated by the first frequency domain resource granularity is greater than the second frequency domain resource granularity.