The invention relates to a service gateway as well as a switching system of network television services and Internet services. The service gateway comprises: a request module for receiving an Internet service request forwarded by a network television services platform or a network television service request initiated by an Internet user terminal and forwarded by an Internet service website; a judging module for judging whether the use of Internet services is permitted or not according to a service account number of network television or whether the use of network television services is permitted or not according to a service account number of Internet; and a service module for providing Internet services to a network television user terminal when the service account number of network television has the privilege to enjoy Internet services or providing network television services to the Internet user terminal when the service account number of Internet has the privilege to use network television services. The invention enables users to enjoy the network television services and Internet services simultaneously on the terminals, so as to realize the service sharing of network television underlying network and Internet.