1. A method for forming, by a first device, a connection with a first gateway by using Bluetooth low energy technology, the method performed by the first device, comprising:obtaining, from a user, a first voice signal associated with the first gateway;
broadcasting first user information for identifying the user and the first voice signal;
receiving an encrypted request message for requesting the connection from the first gateway;
authenticating a voice recognition server which is a server capable of processing a voice signal using the encrypted request message; and
transmitting a message indicating whether to accept the connection to the first gateway based on a result of the authentication,
wherein the first user information is transmitted through a data channel for transmitting and receiving data and the first voice signal is transmitted through an isochronous channel for transmitting and receiving an audio signal.