BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram schematically illustrating the structure of a DB system according to a preferred embodiment of the present invention;
FIG. 2 is a diagram illustrating the flow of information in the DB system;
FIG. 3 is a block diagram illustrating the functional structure of the DB system;
FIG. 4 is a functional block diagram illustrating search-related operations;
FIG. 5 is a diagram illustrating the structuration of elements of information provided;
FIG. 6 is a diagram illustrating element associated information;
FIG. 7 is a diagram illustrating element-advertisement associated information;
FIG. 8 is a diagram illustrating an initial search screen;
FIG. 9 is a diagram illustrating a search result screen;
FIG. 10 is a diagram illustrating a detailed advertising screen;
FIG. 11 is a diagram illustrating the contents of advertisement-access control table information;
FIG. 12 is a diagram illustrating the contents of charging list information;
FIGS. 13 and 14 are diagrams each schematically showing an operational flow of the DB system;
FIG. 15 is a diagram illustrating element associated information in an e-learning system;
FIG. 16 is a diagram illustrating element-advertisement associated information in the e-learning system;
FIG. 17 is a diagram illustrating the hierarchical structure of contents in an auction site;
FIG. 18 is a diagram illustrating element associated information in an auction system;
FIG. 19 is a diagram illustrating element-advertisement associated information in the auction system;
FIG. 20 is a diagram illustrating the hierarchical structure of contents in a real estate search/retrieval site;
FIG. 21 is a diagram illustrating element-advertisement associated information in a real estate search/retrieval system;
FIG. 22 is a diagram illustrating the hierarchical structure in a search/retrieval site for personal computer purchase; and
FIG. 23 is a diagram illustrating element-advertisement associated information in a search/retrieval system for personal computer purchase.