Provided are a method of registering a home appliance in an Internet-of-Things (IoT) server, and a home appliance. The home appliance performs device registration by obtaining access point information and information of a set-up cloud server from a mobile device connected through device-to-device communication, transmitting a temporary password to the mobile device through the device-to-device communication, establishing a communication connection with the set-up cloud server by using the obtained access point information and the obtained information of the set-up cloud server, obtaining user account information from the set-up cloud server by using the temporary password as an identification key, and providing information of the home appliance and the user account information to an IoT server.