Relevance data is displayed in a manner that allows the relevance data to be comprehended visually and intuitively. Relevance data includes element information and attribute information and is displayed as a network of element nodes and attribute nodes. The element information and attribute information is searched, designated as either element information or attribute information, and relevance information is extracted to reflect when an attribute is shared by a more than one element. Furthermore, a first network is displayed in which two element nodes with common attributes are connected. Alternatively, a second network is displayed in which attribute nodes are connected to element nodes when an element node posses an attribute node.