Terminal device, characterized by comprising: a determining module, configured to determine at least one uplink channel of a first target subframe numbered i, wherein i is a subframe number in range of 0∼9, wherein the determining module is further configured to determine, according to a PRACH predefined transmit power and a guaranteed power, a reserved power that is reserved for a base station or a cell group in which a second target subframe numbered x is located, wherein the reserved power is determined when an uplink channel of the second target subframe numbered x comprises a physical random access channel, PRACH, indicated by a physical downlink control channel order, PDCCH, order, wherein the PDCCH order is in a subframe numbered x-k, where k is an integer greater than or equal to 6, wherein a transmission time of the second target subframe numbered x and a transmission time of the first target subframe overlap, a start time of the second target subframe is later than a start time of the first target subframe, the second target subframe is a subframe that belongs to a base station or a cell group different from that of the first target subframe, and x is a subframe number in range of 0∼9; or the reserved power is determined when an uplink channel of the second target subframe numbered x comprises a PRACH determined by using a physical downlink channel of a subframe numbered x-n, wherein n is an integer greater than or equal to 5, the PRACH predefined transmit power is a transmit power predefined for the PRACH, and the guaranteed power is a guaranteed power configured, by using higher layer signaling, for the base station or the cell group in which the second target subframe numbered x is located; and a calculating module, configured to determine, according to the reserved power, a transmit power of each uplink channel in the at least one uplink channel of the first target subframe numbered i, wherein a sum of transmit powers of all uplink channels of the first target subframe numbered i and the reserved power is less than or equal to a maximum transmit power of the terminal device. a determining module, configured to determine at least one uplink channel of a first target subframe numbered i, wherein i is a subframe number in range of 0∼9, wherein the determining module is further configured to determine, according to a PRACH predefined transmit power and a guaranteed power, a reserved power that is reserved for a base station or a cell group in which a second target subframe numbered x is located, wherein the reserved power is determined when an uplink channel of the second target subframe numbered x comprises a physical random access channel, PRACH, indicated by a physical downlink control channel order, PDCCH, order, wherein the PDCCH order is in a subframe numbered x-k, where k is an integer greater than or equal to 6, wherein a transmission time of the second target subframe numbered x and a transmission time of the first target subframe overlap, a start time of the second target subframe is later than a start time of the first target subframe, the second target subframe is a subframe that belongs to a base station or a cell group different from that of the first target subframe, and x is a subframe number in range of 0∼9; or the reserved power is determined when an uplink channel of the second target subframe numbered x comprises a PRACH determined by using a physical downlink channel of a subframe numbered x-n, wherein n is an integer greater than or equal to 5, the PRACH predefined transmit power is a transmit power predefined for the PRACH, and the guaranteed power is a guaranteed power configured, by using higher layer signaling, for the base station or the cell group in which the second target subframe numbered x is located; and a calculating module, configured to determine, according to the reserved power, a transmit power of each uplink channel in the at least one uplink channel of the first target subframe numbered i, wherein a sum of transmit powers of all uplink channels of the first target subframe numbered i and the reserved power is less than or equal to a maximum transmit power of the terminal device.