An electronic device comprising: a first communication device connected to an internal antenna or an external antenna through a selector wherein a gain of the external antenna is higher than a gain of the internal antenna, the internal antenna is inside of a housing of the first communication device, the external antenna is outside the housing, and the first communication device is configured to perform a wireless communication with an external device using the internal antenna when a received signal intensity of internal antenna is not lower than a certain level and with the external device using the external antenna when the received signal intensity is lower than the certain level; a received signal intensity measurement unit configured to measure a first signal intensity indicative of a received signal of the external antenna obtained at a first timing when the first communication device is connected to the external antenna; a memory configured to store the first signal intensity; a first detector configured to detect an abnormality of the external antenna when a second signal intensity indicative of a received signal of the external antenna obtained at a second timing, after the first timing, when the first communication device is connected to external antenna, is less than or equal to a threshold value associated with the first signal intensity stored in the memory; and a notification module configured to notify the abnormality of the external antenna to the external device by the first communication device using the internal antenna or the external antenna when the first detector detects the abnormality of the external antenna. a first communication device connected to an internal antenna or an external antenna through a selector wherein a gain of the external antenna is higher than a gain of the internal antenna, the internal antenna is inside of a housing of the first communication device, the external antenna is outside the housing, and the first communication device is configured to perform a wireless communication with an external device using the internal antenna when a received signal intensity of internal antenna is not lower than a certain level and with the external device using the external antenna when the received signal intensity is lower than the certain level; a received signal intensity measurement unit configured to measure a first signal intensity indicative of a received signal of the external antenna obtained at a first timing when the first communication device is connected to the external antenna; a memory configured to store the first signal intensity; a first detector configured to detect an abnormality of the external antenna when a second signal intensity indicative of a received signal of the external antenna obtained at a second timing, after the first timing, when the first communication device is connected to external antenna, is less than or equal to a threshold value associated with the first signal intensity stored in the memory; and a notification module configured to notify the abnormality of the external antenna to the external device by the first communication device using the internal antenna or the external antenna when the first detector detects the abnormality of the external antenna.