A content service system including a content metadata analyzer module, a widget information acquisition module, a widget administration module, and a widget engine module is provided. The content metadata analyzer module receives a first metadata corresponding to a multimedia content, and generates a widget request or a service metadata according to the first metadata. The widget information acquisition module acquires a widget information of a first widget according to the widget request or the service metadata. The widget administration module installs and executes the first widget according to the widget information, wherein the first widget plays an extended content corresponding to the multimedia content. A content service method and a computer-readable recording medium corresponding to the content service method are also provided.