A convergence device for implementing an Internet Protocol Television (IPTV) service, by integrating a Content Delivery Network component and a network component which provides a network resource support for the CDN component, wherein a communication interface is set between the CDN component and the network component; the CDN component comprises: a first querying unit, which is configured to receive a media service request initiated by a Set Top Box, and to search in a preconfigured service policy template database for a service policy template matching a service type carried by the media service request; a content service unit, which is configured to initiate a network support request to the network component, and to use the service policy template to provide a media stream service for the STB after receiving a success response message fed back by the network component; and a content cancelling acceleration unit, which is configured to, when detecting that the STB closes a media service connection, cancel the service policy template, release resources, and send a policy cancelling request to the network component; the network component comprises: a second querying unit, which is configured to search in a preconfigured network policy template database for a network policy template matching a service policy after receiving the network support request; a request responding unit, which is configured to execute the network policy template, to feed back a success response message to the CDN component when the execution succeeds, and to use the network policy template to provide a network resource support for the CDN component; and a network cancelling acceleration unit, which is configured to cancel the network policy template after receiving the policy cancelling request, wherein the CDN component receives, from the network component, an IPTV user address pool which is maintained by the network component, wherein the CDN component reports, to a CDN centre management system, an information about corresponding relationship between the CDN component of the convergence device and the IPTV user address pool, the CDN centre management system being configured to maintain and manage a plurality of convergence devices, wherein the information is synchronized between the CDN centre management system and an Internet Protocol Television (IPTV) service system such that the IPTV system locates an IPTV user to the CDN component of the convergence device, based on an Internet Protocol address of the user. a first querying unit, which is configured to receive a media service request initiated by a Set Top Box, and to search in a preconfigured service policy template database for a service policy template matching a service type carried by the media service request; a content service unit, which is configured to initiate a network support request to the network component, and to use the service policy template to provide a media stream service for the STB after receiving a success response message fed back by the network component; and a content cancelling acceleration unit, which is configured to, when detecting that the STB closes a media service connection, cancel the service policy template, release resources, and send a policy cancelling request to the network component; a second querying unit, which is configured to search in a preconfigured network policy template database for a network policy template matching a service policy after receiving the network support request; a request responding unit, which is configured to execute the network policy template, to feed back a success response message to the CDN component when the execution succeeds, and to use the network policy template to provide a network resource support for the CDN component; and a network cancelling acceleration unit, which is configured to cancel the network policy template after receiving the policy cancelling request, wherein the CDN component receives, from the network component, an IPTV user address pool which is maintained by the network component, wherein the CDN component reports, to a CDN centre management system, an information about corresponding relationship between the CDN component of the convergence device and the IPTV user address pool, the CDN centre management system being configured to maintain and manage a plurality of convergence devices, wherein the information is synchronized between the CDN centre management system and an Internet Protocol Television (IPTV) service system such that the IPTV system locates an IPTV user to the CDN component of the convergence device, based on an Internet Protocol address of the user.