A downlink control information monitoring method, wherein the method comprises: monitoring, by a terminal, downlink control information in a first time resource unit range according to a first rule, and monitoring, by the terminal, downlink control information in a second time resource unit range according to a second rule, wherein the first time resource unit range is different from the second time resource unit range, and the first rule is different from the second rule, wherein the method further comprises: when detecting, in a current time resource unit, downlink control information used to instruct the terminal to receive or send initially transmitted data, determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range. wherein the determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range comprises: determining, by the terminal, first configuration information, wherein the first configuration information is configured by the base station, or the first configuration information is preconfigured by the terminal, and the first configuration information configures a relative start moment and time length of either of the first time resource unit range and the second time resource unit range; and determining, by the terminal based on the current time resource unit and the first configuration information, the start moment and the time length of the either time resource unit range based on a plurality of consecutive time resource units after the current time resource unit. monitoring, by a terminal, downlink control information in a first time resource unit range according to a first rule, and monitoring, by the terminal, downlink control information in a second time resource unit range according to a second rule, wherein the first time resource unit range is different from the second time resource unit range, and the first rule is different from the second rule, wherein the method further comprises: when detecting, in a current time resource unit, downlink control information used to instruct the terminal to receive or send initially transmitted data, determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range. wherein the determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range comprises: determining, by the terminal, first configuration information, wherein the first configuration information is configured by the base station, or the first configuration information is preconfigured by the terminal, and the first configuration information configures a relative start moment and time length of either of the first time resource unit range and the second time resource unit range; and determining, by the terminal based on the current time resource unit and the first configuration information, the start moment and the time length of the either time resource unit range based on a plurality of consecutive time resource units after the current time resource unit. when detecting, in a current time resource unit, downlink control information used to instruct the terminal to receive or send initially transmitted data, determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range. wherein the determining, by the terminal, the start moment and the time length of either of the first time resource unit range and the second time resource unit range comprises: determining, by the terminal, first configuration information, wherein the first configuration information is configured by the base station, or the first configuration information is preconfigured by the terminal, and the first configuration information configures a relative start moment and time length of either of the first time resource unit range and the second time resource unit range; and determining, by the terminal based on the current time resource unit and the first configuration information, the start moment and the time length of the either time resource unit range based on a plurality of consecutive time resource units after the current time resource unit. determining, by the terminal, first configuration information, wherein the first configuration information is configured by the base station, or the first configuration information is preconfigured by the terminal, and the first configuration information configures a relative start moment and time length of either of the first time resource unit range and the second time resource unit range; and determining, by the terminal based on the current time resource unit and the first configuration information, the start moment and the time length of the either time resource unit range based on a plurality of consecutive time resource units after the current time resource unit.