We propose a differential XSLT stylesheet generation method for arbitrary pairs of XML contents. It is possible to obtain the revised XML document by supplying the XSLT stylesheet with the differential data to the original XML document. Comparing with sending whole revised XML document, the original XML document can be updated by sending less information, the differential data. This paper introduces a difference detection algorithm based on the DOM tree and a difference representation method that permits the expression of difference information. We also discuss a new XSLT function for the proposed method. We also introduce prototype software implemented based on proposed method and evaluation result that shows the effectiveness of our method. An experiment shows that the proposed method is suitable for updating XML contents, especially for web service in the costly mobile network.