A mobile communication terminal, comprising: a first modem configured to transmit a signal in accordance with a first communication scheme; a power amplifier configured to amplify a power level of the signal; a second modem having a power back off circuit and configured to communicate in accordance with a second communication scheme, the second communication scheme being different from the first communication scheme; and a detector configured to detect the amplified power level of the signal, the detector including: a feedback circuit configured to convert the amplified power level of the signal into an analog signal, and output the analog signal; a reception unit configured to receive the analog signal and information identifying the first communication scheme, and output a signal corresponding to the received analog signal and information; and an output unit configured to receive the signal output by the reception unit and to output a particular value to the power back off circuit to trigger the power back off circuit after comparing the signal output from the reception unit and a corresponding predetermined voltage, wherein, by triggering the power back off circuit, it is ensured that a limit value of a specific absorption rate, SAR, is not exceeded. a first modem configured to transmit a signal in accordance with a first communication scheme; a power amplifier configured to amplify a power level of the signal; a second modem having a power back off circuit and configured to communicate in accordance with a second communication scheme, the second communication scheme being different from the first communication scheme; and a detector configured to detect the amplified power level of the signal, the detector including: a feedback circuit configured to convert the amplified power level of the signal into an analog signal, and output the analog signal; a reception unit configured to receive the analog signal and information identifying the first communication scheme, and output a signal corresponding to the received analog signal and information; and an output unit configured to receive the signal output by the reception unit and to output a particular value to the power back off circuit to trigger the power back off circuit after comparing the signal output from the reception unit and a corresponding predetermined voltage, wherein, by triggering the power back off circuit, it is ensured that a limit value of a specific absorption rate, SAR, is not exceeded. a feedback circuit configured to convert the amplified power level of the signal into an analog signal, and output the analog signal; a reception unit configured to receive the analog signal and information identifying the first communication scheme, and output a signal corresponding to the received analog signal and information; and an output unit configured to receive the signal output by the reception unit and to output a particular value to the power back off circuit to trigger the power back off circuit after comparing the signal output from the reception unit and a corresponding predetermined voltage, wherein, by triggering the power back off circuit, it is ensured that a limit value of a specific absorption rate, SAR, is not exceeded.