Disclosed are a method, apparatus, and computer program, product for mashing up web applications. The method includes: obtaining at least two document object models (DOM) corresponding to at least two web applications respectively; merging nodes of the at least two document object models to obtain a new document object model; connecting, on the new document object model, the nodes belonging respectively to the at least two document object models; and obtaining a new web application from the new document object model after connection.