Patent US 6,460,033

A plurality of items are browsed using a non-unary tree which relates the plurality of items and a browsing sequence. A signal is outputted to display content associated with a current item in the browsing sequence. In response to receiving a selection of one of a first control and a second control, all items which are tree-descendants of the current item are removed from the browsing sequence if the first control has been selected and the current item is an internal item of the tree. Further in response to receiving the selection, a signal is outputted to display content associated with an item subsequent to the current item in the browsing sequence if the current item is a non-final item in the browsing sequence.