Apparatus for displaying information from at least one information source, the information being arranged, labeled or indexed to define a hierarchical information structure, the apparatus comprising: a display controller for displaying information and user selectable menu items on at least one display, each menu item corresponding to a node of the information hierarchy or to information in the at least one information source. The display controller is configured such that during said navigation, in response to a user selection of a menu item from either one of the first or second display areas, a sub-set of menu items corresponding to sub-nodes and/or information in the information hierarchy at the level of the hierarchy below said selected menu item is displayed in the other of the second or first display areas.