PURPOSE: To provide the method reducing the danger of missing a direction at the retrieval of data and capable of expression and display to a node with an inseparable data group according to the change of the point of view and to an isolated node.

CONSTITUTION: The type of link and the visible coefficient are inputted in S11. In S12, the network is copied from a data base to a working area. Then the node coupled with a link having the degree of relation higher than the visible coefficient according to the inputted visible coefficient in S13 to S19 changes working area to absorb the node of the destination in the node of the source. The structure is displayed in a blowser by referring to the changed working area, and the media data of the data base is displayed on a window.