An electronic device comprising: a display; at least one sensor device (138, 139) configured to detect an object located in proximity of the electronic device and a sensor configured to detect whether a protective cover is closed on the display such that the at least one sensor device (138, 139) is covered by the protective cover; and at least one processor configured to: identify, by using the sensor, whether or not the protective cover is closed on the display; upon identifying that the protective cover is not closed such that the at least one sensor device (138, 139) is not covered by the protective cover: identify whether the object located in proximity of the electronic device is detected by using the at least one sensor device (138, 139), upon identifying that the object is not detected, output a transmission power with a default value, and upon identifying that the object is detected, output a transmission power with a predetermined value less than the default value; and upon identifying that the protective cover is closed such that the at least one sensor device (138, 139) is covered by the protective cover: identify whether the electronic device is operating in a non-contact mode, upon identifying that the electronic device is operating in the non-contact mode, output the transmission power with the default value, and upon identifying that the electronic device is not operating in the non-contact mode, output the transmission power with the predetermined value less than the default value, wherein the non-contact mode refers to a mode in which the electronic device is not in contact with a human body, wherein said contact comprises contact of the electronic device with a head of the human body. a display; at least one sensor device (138, 139) configured to detect an object located in proximity of the electronic device and a sensor configured to detect whether a protective cover is closed on the display such that the at least one sensor device (138, 139) is covered by the protective cover; and at least one processor configured to: identify, by using the sensor, whether or not the protective cover is closed on the display; upon identifying that the protective cover is not closed such that the at least one sensor device (138, 139) is not covered by the protective cover: identify whether the object located in proximity of the electronic device is detected by using the at least one sensor device (138, 139), upon identifying that the object is not detected, output a transmission power with a default value, and upon identifying that the object is detected, output a transmission power with a predetermined value less than the default value; and upon identifying that the protective cover is closed such that the at least one sensor device (138, 139) is covered by the protective cover: identify whether the electronic device is operating in a non-contact mode, upon identifying that the electronic device is operating in the non-contact mode, output the transmission power with the default value, and upon identifying that the electronic device is not operating in the non-contact mode, output the transmission power with the predetermined value less than the default value, wherein the non-contact mode refers to a mode in which the electronic device is not in contact with a human body, wherein said contact comprises contact of the electronic device with a head of the human body. identify, by using the sensor, whether or not the protective cover is closed on the display; upon identifying that the protective cover is not closed such that the at least one sensor device (138, 139) is not covered by the protective cover: identify whether the object located in proximity of the electronic device is detected by using the at least one sensor device (138, 139), upon identifying that the object is not detected, output a transmission power with a default value, and upon identifying that the object is detected, output a transmission power with a predetermined value less than the default value; and identify whether the object located in proximity of the electronic device is detected by using the at least one sensor device (138, 139), upon identifying that the object is not detected, output a transmission power with a default value, and upon identifying that the object is detected, output a transmission power with a predetermined value less than the default value; and upon identifying that the protective cover is closed such that the at least one sensor device (138, 139) is covered by the protective cover: identify whether the electronic device is operating in a non-contact mode, upon identifying that the electronic device is operating in the non-contact mode, output the transmission power with the default value, and upon identifying that the electronic device is not operating in the non-contact mode, output the transmission power with the predetermined value less than the default value, wherein the non-contact mode refers to a mode in which the electronic device is not in contact with a human body, wherein said contact comprises contact of the electronic device with a head of the human body. identify whether the electronic device is operating in a non-contact mode, upon identifying that the electronic device is operating in the non-contact mode, output the transmission power with the default value, and upon identifying that the electronic device is not operating in the non-contact mode, output the transmission power with the predetermined value less than the default value,