Service system and method of Digital broadcasting, Receiving method and receiver

A digital broadcasting service method and system using the Internet, a digital broadcasting receiving method, and a digital broadcasting receiver are provided to enable a user to use services provided from various system operators without being limited to a service provided from a specific system operator, thereby improving user's convenience. A digital broadcasting service system comprises a receiver(100), a first entry point(110), a second entry point(120), a first service provider(130), a third entry point(140), and a second service provider(150). Channel numbers are used for identifying each service provider. Entry numbers are used for identifying each IPTV(Internet Protocol Television) system operator. The receiver connects with the entry points registered in the receiver or connects with an entry point selected by a user to acquire discovery information. The IPTV system operators of the first and second entry points check the subscription information of the receiver which attempts to connect with the entry points. The IPTV system operators transmit the entry numbers with information about the service providers to the receiver. The receiver stores the information about the service providers and the entry numbers received from each IPTV system operator. The receiver connects with all servers of the first service provider linked to each IPTV system operator by using the connection information of a service provider in the information about service providers. The first service provider transmits service discovery information to the receiver. The service discovery information includes connection information about a service server storing services and channel information about the first service provider. The receiver connects with the server storing the service which a user wants by using the connection information about the service server and provides the service stored in the service server to the user.