A method for determining power, wherein a user equipment UE is configured with multiple cells, a length of a first subframe of a first cell is corresponding to a length of N second subframes of a second cell, and the method comprises: calculating, by the UE, a first power requirement on the first subframe, and N second power requirements on the N second subframes; calculating, by the UE, a power indicator on the N second subframes according to the N second power requirements; and determining, by the UE, transmit powers on the first subframe and the N second subframes according to a magnitude relationship between a maximum transmit power and a sum of the first power requirement and the power indicator, wherein the first subframe is denoted as a subframe i, the N second subframes are denoted as subframes i1, i2,..., and iN, the first power requirement is denoted as P req_c1 (i), the second power requirement is denoted as P req_c2 (ij), the maximum transmit power corresponding to the first subframe i is denoted as P MAX (i), N is a positive integer greater than 1, and a value range of j is 1 to N, wherein if at least one second subframe of the N second subframes transmits a physical uplink control channel PUCCH and a physical uplink shared channel PUSCH, P req_c2 (ij) = P PUCCH,c2 (ij) + P PUSCH,c2 (ij); and the calculating a power indicator on the N second subframes according to the N second power requirements comprises: denoting the power indicator as P req_c2 (i), and calculating the power indicator by using the following formula: P req_c2 (i) = P PUCCH,c2 (i) + P PUSCH,c2 (i), wherein P PUCCH,c2 (i) represents a PUCCH power indicator on the N second subframes; P PUCCH, c 2 i = max P PUCCH, c 2 i 1, P PUCCH, c 2 i 2,..., P PUCCH, c 2 iN; or P PUCCH, c 2 i = min P PUCCH, c 2 i 1, P PUCCH, c 2 i 2,..., P PUCCH, c 2 iN; or P PUCCH, c 2 i = α × P PUCCH, c 2 i 1 + P PUCCH, c 2 i 2 +... + P PUCCH, c 2 iN; and P PUSCH,c2 (i) represents a PUSCH power indicator on the N second subframes; P PUSCH, c 2 i = max P PUSCH, c 2 i 1, P PUSCH, c 2 i 2,..., P PUSCH, c 2 iN; or P PUSCH, c 2 i = min P PUSCH, c 2 i 1, P PUSCH, c 2 i 2,..., P PUSCH, c 2 iN; or P PUSCH, c 2 i = α × P PUSCH, c 2 i 1 + P PUSCH, c 2 i 2 +... + P PUSCH, c 2 iN, wherein max represents using a maximum value, min represents using a minimum value, α is a power parameter, and the power parameter is preconfigured or the power parameter is pre-obtained by the UE from a base station. calculating, by the UE, a first power requirement on the first subframe, and N second power requirements on the N second subframes; calculating, by the UE, a power indicator on the N second subframes according to the N second power requirements; and determining, by the UE, transmit powers on the first subframe and the N second subframes according to a magnitude relationship between a maximum transmit power and a sum of the first power requirement and the power indicator, wherein the first subframe is denoted as a subframe i, the N second subframes are denoted as subframes i1, i2,..., and iN, the first power requirement is denoted as P req_c1 (i), the second power requirement is denoted as P req_c2 (ij), the maximum transmit power corresponding to the first subframe i is denoted as P MAX (i), N is a positive integer greater than 1, and a value range of j is 1 to N, wherein if at least one second subframe of the N second subframes transmits a physical uplink control channel PUCCH and a physical uplink shared channel PUSCH, P req_c2 (ij) = P PUCCH,c2 (ij) + P PUSCH,c2 (ij); and the calculating a power indicator on the N second subframes according to the N second power requirements comprises: denoting the power indicator as P req_c2 (i), and calculating the power indicator by using the following formula: P req_c2 (i) = P PUCCH,c2 (i) + P PUSCH,c2 (i), wherein P PUCCH,c2 (i) represents a PUCCH power indicator on the N second subframes; P PUCCH, c 2 i = max P PUCCH, c 2 i 1, P PUCCH, c 2 i 2,..., P PUCCH, c 2 iN; or P PUCCH, c 2 i = min P PUCCH, c 2 i 1, P PUCCH, c 2 i 2,..., P PUCCH, c 2 iN; or P PUCCH, c 2 i = α × P PUCCH, c 2 i 1 + P PUCCH, c 2 i 2 +... + P PUCCH, c 2 iN; and P PUSCH,c2 (i) represents a PUSCH power indicator on the N second subframes; P PUSCH, c 2 i = max P PUSCH, c 2 i 1, P PUSCH, c 2 i 2,..., P PUSCH, c 2 iN; or P PUSCH, c 2 i = min P PUSCH, c 2 i 1, P PUSCH, c 2 i 2,..., P PUSCH, c 2 iN; or P PUSCH, c 2 i = α × P PUSCH, c 2 i 1 + P PUSCH, c 2 i 2 +... + P PUSCH, c 2 iN, wherein max represents using a maximum value, min represents using a minimum value, α is a power parameter, and the power parameter is preconfigured or the power parameter is pre-obtained by the UE from a base station.