The network service system includes a transmission controller and an authentication server. The transmission controller determines whether a service request belongs to a service of a proprietary network registered with the mobile edge computing platform and comprises an authentication request. The service request is from an electronic device. When the transmission controller determines that the service request belongs to a service of the proprietary network and comprises an authentication request, the authentication server executes an authentication mechanism according to packet information that corresponds to the service request, and the authentication mechanism triggers a permission server to confirm the identity information and permission information of the electronic device.