A first electronic device includes a touchscreen and a processor which transmits first information related to the first electronic device or a user account of the first electronic device through a first communication network to authenticate a second electronic device. The processor further obtains second information to authenticate the second electronic device transmitted from the first server based on the first information through a second communication network. An authentication request includes the first information and is transmitted from the second electronic device to a first server which supports an authentication function. A first screen is displayed on the touchscreen for receiving a first input related to the second information. Authentication information is received through the touchscreen based on the received first input, and the authentication information is transmitted to the first server to authenticate the second electronic device.