A flexible electronic device , comprising: a communication unit (170; 220; 610; 710, 740); a plurality of antennas ; a switch unit (620; 720, 750) that electrically connects the communication unit and the plurality of antennas; a sensor unit (240; 650); and a processor (120; 210; 770) configured to control the switch unit to sequentially switch the plurality of antennas based on a predetermined schedule, in order to transmit a wireless signal through the plurality of antennas having different main emission directions, wherein the processor (120; 210; 770) is further configured to measure the receive signal strength of at least one antenna corresponding to sensor information received by the sensor unit (240; 650) among the plurality of antennas having different main emission directions, and compare the measured receive signal strength and a reference value to determine whether the receive signal strength of the at least one antenna is less than or equal to the reference value, and wherein the processor (120; 210; 770) is further configured to control the switch unit (620; 720, 750) not to switch at least one antenna having a receive signal strength reduced to be less than or equal to the reference value, and to sequentially switch remaining antennas except for the at least one antenna, among the plurality of antennas, based on the predetermined schedule, wherein said sensor information corresponds to a bending signal of the flexible electronic device and an input in which an external object approaches or contacts at least one antenna according to the bending signal received through the sensor unit (240; 650) disposed at a position at which the plurality of antennas having different main emission directions are provided. a communication unit (170; 220; 610; 710, 740); a plurality of antennas ; a switch unit (620; 720, 750) that electrically connects the communication unit and the plurality of antennas; a sensor unit (240; 650); and a processor (120; 210; 770) configured to control the switch unit to sequentially switch the plurality of antennas based on a predetermined schedule, in order to transmit a wireless signal through the plurality of antennas having different main emission directions, wherein the processor (120; 210; 770) is further configured to measure the receive signal strength of at least one antenna corresponding to sensor information received by the sensor unit (240; 650) among the plurality of antennas having different main emission directions, and compare the measured receive signal strength and a reference value to determine whether the receive signal strength of the at least one antenna is less than or equal to the reference value, and wherein the processor (120; 210; 770) is further configured to control the switch unit (620; 720, 750) not to switch at least one antenna having a receive signal strength reduced to be less than or equal to the reference value, and to sequentially switch remaining antennas except for the at least one antenna, among the plurality of antennas, based on the predetermined schedule, wherein said sensor information corresponds to a bending signal of the flexible electronic device and an input in which an external object approaches or contacts at least one antenna according to the bending signal received through the sensor unit (240; 650) disposed at a position at which the plurality of antennas having different main emission directions are provided. <EOS>