An information processing apparatus comprises a memory that stores structure information indicating a structure of functions of a Web application. Upon acquiring extension page information defining an extension function of the Web application, the apparatus sets up the extension page information in the memory according to a setup command, and determines, based on the setup command and the structure information, an insertion position of the extension function in the structure of functions of the Web application. Then, upon receipt of a request for generation of a Web page that represents the structure of functions of the Web application, the apparatus generates an extended Web page based on the structure information and the insertion position, by inserting extension function information indicating the extension function into a Web page according to the structure information.