An apparatus for impedance matching in a dual standby portable terminal comprising: a first module comprising a first antenna adapted to transmit or receive a radio frequency signal according to a frequency of the radio communication protocol of the first module; and a second module, wherein the second module comprises: a second antenna adapted to transmit or receive a radio frequency signal according to a frequency of the radio communication protocol of said second module; a second radio communication unit having a second sending end for outputting a radio frequency signal and a second receiving end for receiving a radio frequency signal; a second impedance matching circuit unit having a specific impedance value; a second switch unit for connecting at least one of the second sending end, the second receiving end and the second impedance matching circuit unit to the second antenna; and a second control unit for controlling the second switch unit to selectively connect the at least one of the second sending end, the second receiving end and the second impedance matching circuit unit to the second antenna, characterized in that the second control unit is configured to control the second switch unit to: switch to a first state for disconnecting the second antenna from the second radio communication unit and connecting the second antenna to the second impedance matching circuit unit when the second module is not performing an operation of transmission or reception; and switch to a second state for disconnecting the second antenna from the second impedance matching unit and connecting the second antenna to the second radio communication unit when the second module is performing an operation of transmission or reception. a first module comprising a first antenna adapted to transmit or receive a radio frequency signal according to a frequency of the radio communication protocol of the first module; and a second module, a second antenna adapted to transmit or receive a radio frequency signal according to a frequency of the radio communication protocol of said second module; a second radio communication unit having a second sending end for outputting a radio frequency signal and a second receiving end for receiving a radio frequency signal; a second impedance matching circuit unit having a specific impedance value; a second switch unit for connecting at least one of the second sending end, the second receiving end and the second impedance matching circuit unit to the second antenna; and a second control unit for controlling the second switch unit to selectively connect the at least one of the second sending end, the second receiving end and the second impedance matching circuit unit to the second antenna, characterized in that the second control unit is configured to control the second switch unit to: switch to a first state for disconnecting the second antenna from the second radio communication unit and connecting the second antenna to the second impedance matching circuit unit when the second module is not performing an operation of transmission or reception; and switch to a second state for disconnecting the second antenna from the second impedance matching unit and connecting the second antenna to the second radio communication unit when the second module is performing an operation of transmission or reception. switch to a first state for disconnecting the second antenna from the second radio communication unit and connecting the second antenna to the second impedance matching circuit unit when the second module is not performing an operation of transmission or reception; and switch to a second state for disconnecting the second antenna from the second impedance matching unit and connecting the second antenna to the second radio communication unit when the second module is performing an operation of transmission or reception.