A method performed by an electronic device in a wireless communication system is provided. The method comprises obtaining a power reduction amount based on first target power and first transmission power of the first signal, while transmitting, through at least one antenna, a first signal supporting a first network and a second signal supporting a second network distinguished from the first network. The method comprises comparing the obtained power reduction amount with a first reference value and a second reference value less than the first reference value. The method comprises transmitting one of the first signal or the second signal through the at least one antenna by controlling a wireless communication circuit, based on the comparison result, when the power reduction amount is greater than the first reference value.