the present invention represents a global state of branches in a whole dendrogram as well as detail of states of individual subtrees , to aid focusing of groupings and selection of a clustering method . the present invention selects a branch / subtree in a dendrogram displays the subtree on a separate window , replaces the subtree with an icon then restores the icon into the original subtree , and / or searches keywords contained in information of biopolymers in the subtree then highlight the locations of biopolymers containing the keywords in its information .