An interface generator 6 generates a user interface for a mobile communication device 2 by providing, at step S2, a menu of functional components to a website owner 5 and receiving an indication of which of the functional components are selected for inclusion in the user interface from the website owner, at step S3. When the interface generator 6 receives a request for the user interface from the mobile communication device 2, at step S7, it delivers the user interface to the mobile communication device, at step S8, for display by the mobile communication device 2. The generated user interface includes the selected functional components and selection of a functional component included in the displayed user interface by a user of the mobile communication device 2 causes the mobile communication device 2 to carry out a task.