A technique for sequentially updating a recording medium as if sub contents, related to a video image as a main content recorded on the recording medium, are stored on the recording medium, such that the sub contents can be reproduced. When reproduction of the video image as a main content recorded on an optical disk has been completed, a content server is accessed in accordance with bind definition designation information stored on the optical disk. Then, bind definition information in which link information to access a sub content such as special video images stored on the content server is described is downloaded. Then, based on the downloaded bind definition information, the link information to access the sub content is stored onto the optical disk, thereby the sub content can be reproduced.