A wireless communication terminal device having a multi-antenna, the wireless communication terminal device comprising: a first radio frequency, RF, module (120, 250) comprising a first antenna array; a second RF module (130, 260) comprising a second antenna array; a third RF module (110, 240) connected to each of the first RF module and the second RF module (130, 260) by a cable having a predetermined length; and a digital modem configured to: output a first test signal to the third RF module (110, 240), receive a second test signal from the third RF module (110, 240), in response to the first test signal, and calibrate a phase value for each of first chain combinations formed by the first antenna array and the second antenna array, based on the first test signal and the second test signal; and a member configured to form a transmission path and a reception path between the first RF module (120, 250) and the second RF module (130, 260), wherein the transmission path is configured by the third RF module (110, 240) and the first RF module (120, 250) to transmit the first test signal, and wherein the reception path is configured by the second RF module (130, 260) and the third RF module (110, 240) to receive the first test signal and output the second test signal to the digital modem. a first radio frequency, RF, module (120, 250) comprising a first antenna array; a second RF module (130, 260) comprising a second antenna array; a third RF module (110, 240) connected to each of the first RF module and the second RF module (130, 260) by a cable having a predetermined length; and a digital modem configured to: output a first test signal to the third RF module (110, 240), receive a second test signal from the third RF module (110, 240), in response to the first test signal, and calibrate a phase value for each of first chain combinations formed by the first antenna array and the second antenna array, based on the first test signal and the second test signal; and a member configured to form a transmission path and a reception path between the first RF module (120, 250) and the second RF module (130, 260), wherein the transmission path is configured by the third RF module (110, 240) and the first RF module (120, 250) to transmit the first test signal, and wherein the reception path is configured by the second RF module (130, 260) and the third RF module (110, 240) to receive the first test signal and output the second test signal to the digital modem. output a first test signal to the third RF module (110, 240), receive a second test signal from the third RF module (110, 240), in response to the first test signal, and calibrate a phase value for each of first chain combinations formed by the first antenna array and the second antenna array, based on the first test signal and the second test signal; and a member configured to form a transmission path and a reception path between the first RF module (120, 250) and the second RF module (130, 260), wherein the transmission path is configured by the third RF module (110, 240) and the first RF module (120, 250) to transmit the first test signal, and wherein the reception path is configured by the second RF module (130, 260) and the third RF module (110, 240) to receive the first test signal and output the second test signal to the digital modem.