Disclosed herein is a method of connection of home appliance to a network, a network-connection system for home appliances, and an apparatus related to a network-connection setting for home appliances. The network connection method of home appliance includes an operation in which a terminal device receives an input of an authentication key of an access point (AP) apparatus and the terminal device or the AP apparatus verifies and authenticates the authentication key; an operation in which a home appliance is set to be in a state of communicating with the terminal device; an operation in which the home appliance is interconnected to the terminal device and the terminal device transmits an identification number and the certificated authentication key of the AP apparatus to the home appliance; and an operation in which the home appliance is connected to the AP apparatus based on the identification number and the authentication key of the AP apparatus.