A method for transmitting a control channel, comprising: determining m physical resource block pairs used for transmitting a control channel to be transmitted, wherein the m physical resource block pairs comprise mxn first physical resource elements, the number of resource elements occupied by each physical resource block pair is equal to the number of resource elements occupied by n first physical resource elements, and each of the first physical resource elements comprises q second physical resource elements, wherein m≥1, n≥1, q≥2, and m, n, and q are all integers; determining an aggregation level L of the control channel to be transmitted, wherein L≥1, and L is an integer; determining, according to the aggregation level L, a first control channel candidate at the aggregation level L, wherein the first control channel candidate corresponds to L first physical resource elements, and corresponds to Lxq second physical resource elements; and placing, on physical resources to which the first control channel candidate is mapped, control information of the control channel to be transmitted, and transmitting the control information; characterized in that: each of the physical resource block pairs comprises n sub-blocks, and each sub-block comprises q second physical resource elements; the m physical resource block pairs comprise n sub-block groups, each sub-block group comprises m sub-blocks, which are located in different physical resource block pairs, and numbers of the mxn first physical resource elements comprised in the m physical resource block pairs are respectively x, x+1,..., x+mxn-1; each sub-block group comprises mxq second physical resource elements; and numbers of m first physical resource elements in each of the sub-block groups are y, y+1,..., y+m-1; and values of y are x, x+m, x+2m,..., x+(n-1) xm; the first control channel candidate at the aggregation level L consecutively occupies L distributed first physical resource elements, wherein a start number of the L distributed first physical resource elements is z and satisfies (z) mod = 0, wherein mod indicates a modulo operation; and in the m physical resource block pairs, any sub-block in any physical resource block pair corresponds to one localized first physical resource element. determining m physical resource block pairs used for transmitting a control channel to be transmitted, wherein the m physical resource block pairs comprise mxn first physical resource elements, the number of resource elements occupied by each physical resource block pair is equal to the number of resource elements occupied by n first physical resource elements, and each of the first physical resource elements comprises q second physical resource elements, wherein m≥1, n≥1, q≥2, and m, n, and q are all integers; determining an aggregation level L of the control channel to be transmitted, wherein L≥1, and L is an integer; determining, according to the aggregation level L, a first control channel candidate at the aggregation level L, wherein the first control channel candidate corresponds to L first physical resource elements, and corresponds to Lxq second physical resource elements; and placing, on physical resources to which the first control channel candidate is mapped, control information of the control channel to be transmitted, and transmitting the control information; each of the physical resource block pairs comprises n sub-blocks, and each sub-block comprises q second physical resource elements; the m physical resource block pairs comprise n sub-block groups, each sub-block group comprises m sub-blocks, which are located in different physical resource block pairs, and numbers of the mxn first physical resource elements comprised in the m physical resource block pairs are respectively x, x+1,..., x+mxn-1; each sub-block group comprises mxq second physical resource elements; and numbers of m first physical resource elements in each of the sub-block groups are y, y+1,..., y+m-1; and values of y are x, x+m, x+2m,..., x+(n-1) xm; the first control channel candidate at the aggregation level L consecutively occupies L distributed first physical resource elements, wherein a start number of the L distributed first physical resource elements is z and satisfies (z) mod = 0, wherein mod indicates a modulo operation; and in the m physical resource block pairs, any sub-block in any physical resource block pair corresponds to one localized first physical resource element.