Methods and apparatuses are provided for reporting power headroom of a user equipment (UE). It is determined whether a simultaneous physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission is configured. First power headroom information and second power headroom information are, if the simultaneous PUCCH and PUSCH transmission is configured. The first power headroom information and the second power headroom information are simultaneously transmitted to a base station. The first power headroom information is obtained by subtracting a PUSCH transmit power from a maximum UE transmit power in a subframe, and the second power headroom information is obtained by subtracting a PUCCH transmit power and the PUSCH transmit power from the maximum UE transmit power in the subframe.