A downlink control information detection method, comprising: receiving, by a terminal device, first signaling, wherein the first signaling comprises configuration information of a search space located in a short transmission time internal, STTI; determining, by the terminal device based on the configuration information of the search space, a frequency domain resource or a control channel element, CCE, resource occupied by the search space; and detecting, by the terminal device, downlink control information in the search space, characterized in that before the detecting, by the terminal device, downlink control information in the search space, the method further comprises: receiving, by the terminal device, second signaling, wherein the second signaling indicates a resource occupied by a control channel area, the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs in a control channel element group CCEG i-1 are configured for the control channel area, i is a positive integer not greater than N CCEG, and the CCEG i-1 consists of G CCEs, G is a positive integer, and H is a nonnegative integer not greater than G; and determining, by the terminal device, the control channel area according to the second signaling, wherein the search space is located in the control channel area. receiving, by a terminal device, first signaling, wherein the first signaling comprises configuration information of a search space located in a short transmission time internal, STTI; determining, by the terminal device based on the configuration information of the search space, a frequency domain resource or a control channel element, CCE, resource occupied by the search space; and detecting, by the terminal device, downlink control information in the search space, characterized in that before the detecting, by the terminal device, downlink control information in the search space, the method further comprises: receiving, by the terminal device, second signaling, wherein the second signaling indicates a resource occupied by a control channel area, the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs in a control channel element group CCEG i-1 are configured for the control channel area, i is a positive integer not greater than N CCEG, and the CCEG i-1 consists of G CCEs, G is a positive integer, and H is a nonnegative integer not greater than G; and determining, by the terminal device, the control channel area according to the second signaling, wherein the search space is located in the control channel area. receiving, by the terminal device, second signaling, wherein the second signaling indicates a resource occupied by a control channel area, the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs in a control channel element group CCEG i-1 are configured for the control channel area, i is a positive integer not greater than N CCEG, and the CCEG i-1 consists of G CCEs, G is a positive integer, and H is a nonnegative integer not greater than G; and determining, by the terminal device, the control channel area according to the second signaling, wherein the search space is located in the control channel area.