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 m×n 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=2, 4, or 8, 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 L×q 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; the method further comprising: 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 m×n first physical resource elements comprised in the m physical resource block pairs are respectively x, x+1,..., x+m×n-1; each sub-block group comprises m×q 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)×m; 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 m×n 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=2, 4, or 8, 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 L×q 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; the method further comprising: 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 m×n first physical resource elements comprised in the m physical resource block pairs are respectively x, x+1,..., x+m×n-1; each sub-block group comprises m×q 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)×m; 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 m×n first physical resource elements comprised in the m physical resource block pairs are respectively x, x+1,..., x+m×n-1; each sub-block group comprises m×q 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)×m; 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.