1. A method for visualizing on a two-dimensional screen a hierarchical information structure which is based on nodes that are interconnected by edges, said method being characterized by the steps of: selecting an actual root node, and visualizing the root node on the screen as a fisheyed representation of a root node block, through downstepping selectably displaying at one or more next-lower hierarchical levels a descendant node of said actual root node, whilst at each downstepping dividing said representation along alternatingly at least a first and a second coordinate direction into lower level visual slices, of which said selected descendant is placed in a central part of the fisheye, and allowing to access at least a central node of the actual fisheye.