A terminal device in a long term evolution, LTE, system, the terminal device comprising: a receiving unit, configured to receive uplink grant information transmitted by a network device, and the uplink grant information is used to instruct the terminal device to transmit a first uplink channel in a first sub-slot and to transmit a second uplink channel in a second sub-slot, wherein the first uplink channel comprises uplink data and does not comprise a reference signal, the second uplink channel comprises a reference signal and does not comprise uplink data, the first sub-slot and the second sub-slot are adjacent sub-slots on a first carrier, the first sub-slot is located previous to the second sub-slot, and the reference signal comprised in the second uplink channel is used to demodulate the uplink data comprised in the first uplink channel; a determining unit, configured to determine, when there are at least two uplink channels overlapping in the first sub-slot and a total transmitting power for transmitting the at least two uplink channels exceeds a maximum transmitting power of the terminal device, according to a priority of uplink channel, whether to transmit the first uplink channel in the first sub-slot, wherein the priority of uplink channel from low to high comprises: an uplink channel without Hybrid Automatic Repeat request-Acknowledgement, HARQ-ACK, on a subframe; an uplink channel without HARQ-ACK in a slot; an uplink channel without HARQ-ACK without reference signal in a sub-slot; an uplink channel without HARQ-ACK with reference signal in a sub-slot; an uplink channel with HARQ-ACK on a subframe; an uplink channel with HARQ-ACK in a slot; an uplink channel with HARQ-ACK in a sub-slot; wherein the determining unit is further configured to: if the first uplink channel does not comprise the HARQ-ACK, determine, according to the priority of uplink channel without HARQ-ACK with reference signal in a sub-slot, whether to transmit the first uplink channel in the first sub-slot. a receiving unit, configured to receive uplink grant information transmitted by a network device, and the uplink grant information is used to instruct the terminal device to transmit a first uplink channel in a first sub-slot and to transmit a second uplink channel in a second sub-slot, wherein the first uplink channel comprises uplink data and does not comprise a reference signal, the second uplink channel comprises a reference signal and does not comprise uplink data, the first sub-slot and the second sub-slot are adjacent sub-slots on a first carrier, the first sub-slot is located previous to the second sub-slot, and the reference signal comprised in the second uplink channel is used to demodulate the uplink data comprised in the first uplink channel; a determining unit, configured to determine, when there are at least two uplink channels overlapping in the first sub-slot and a total transmitting power for transmitting the at least two uplink channels exceeds a maximum transmitting power of the terminal device, according to a priority of uplink channel, whether to transmit the first uplink channel in the first sub-slot, wherein the priority of uplink channel from low to high comprises: an uplink channel without Hybrid Automatic Repeat request-Acknowledgement, HARQ-ACK, on a subframe; an uplink channel without HARQ-ACK in a slot; an uplink channel without HARQ-ACK without reference signal in a sub-slot; an uplink channel without HARQ-ACK with reference signal in a sub-slot; an uplink channel with HARQ-ACK on a subframe; an uplink channel with HARQ-ACK in a slot; an uplink channel with HARQ-ACK in a sub-slot; wherein the determining unit is further configured to: if the first uplink channel does not comprise the HARQ-ACK, determine, according to the priority of uplink channel without HARQ-ACK with reference signal in a sub-slot, whether to transmit the first uplink channel in the first sub-slot.