The invention relates to a multimedia content self-adaption method and a multimedia broadcast system. The multimedia content self-adaption method comprises the following steps: acquiring contextual information; solving a media content adaption problem according to the acquired contextual information. By adopting the multimedia content self-adaption method and the multimedia broadcast system provided by the invention, content adaption to an AV broadcast environment is achieved under the standard of UPnP AV, so that intelligent multimedia service can be provided.