A method for transmitting signals using a plurality of component carriers in a wireless communication system. The method according to one embodiment includes controlling transmission powers for one or more channels per each component carrier; and checking whether a total transmission power of a plurality of channels for simultaneous transmission over the plurality of component carriers exceeds a total maximum transmission power configured for a communication apparatus or not, the plurality of channels including a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH); and if the total transmission power of the plurality of channels over the plurality of component carriers exceeds the total maximum transmission power, adjusting a transmission power of the PUSCH in such a way that the total transmission power of the plurality of channels over the plurality of component carriers does not exceed the total maximum transmission power transmission power.