Disclosed are an electronic terminal device and the operating method thereof which limit the use of the Internet and applications of the electronic terminal device based on a predetermined first scheduling rule for limiting the use of the Internet and applications set in the electronic terminal device, but when the electronic terminal device accesses a router device in which a predetermined second scheduling rule is set, provide a technique for limiting Internet use through the router device to prevent a user of the electronic terminal device from using the Internet and applications indiscriminately.