1. An information processing device, comprising: an extracting unit configured to extract a variation of a feature quantity of a content between a previous frame and a next frame at a display time; a first detecting unit configured to detect a point in the content where the variation of the feature quantity is a first predetermined amount or more, wherein the point is where a watermark information starts to be embedded; a second detecting unit configured to detect components of the watermark information including components corresponding to respective intervals in the content, based on the point; a determining unit configured to determine a reliability of the watermark information that is detected; and a selecting unit configured to select a first watermark information from the watermark information based on a result of determination determined by the determining unit.