A network system of a home appliance configured to set up a network of the home appliance by using a terminal, and a network set-up method of the same, after converting a home appliance having built with a WIFI module into an AP to enable the terminal to be connected to an AP home appliance, the information stored at the terminal is transmitted to the AP home appliance, and thus the WIFI may be set up without a separate manipulation of a user at the time of setting up the WIFI of the home appliance without adding an input/output apparatus such as a display apparatus or an interface, the set-up value of the AP, the device information, and the device authentication key may be changed, and thus is safer from hack attacks, an AP is not needed to be provided, and thus a cost-related advantage may be obtained.