1. A hyper-text document preparing apparatus, comprising: receiving means for receiving pieces of character information respectively indicating characters for a hyper-text document indicated by a node, pieces of connection information respectively indicating a connection of a node or a group of nodes with another node or another group of nodes and pieces of connection type information respectively indicating a type of the connection; node managing means for preparing or revising each of a plurality of nodes according to the pieces of character information to produce pieces of node information respectively indicating contents of each node; hierarchy structure managing means for establishing or revising a connection-relationship between a node or a group of nodes and another node or another group of nodes according to one piece of connection information and one piece of connection type information corresponding to the connection information for each of the nodes of which the pieces of node information are produced by the node managing means and producing hierarchy structure information indicating a hierarchy structure in which the nodes having the connection-relationships with each other are arranged; and hyper-text document preparing means for preparing a group of hyper-text documents, in which a plurality of hyper-text documents are arranged in the hierarchy structure, from the node information produced by the node managing means and the hierarchy structure information produced by the hierarchy structure managing means.