12. An information extraction rule making support method comprising: storing an extraction object document, which is an electronic document of an information extraction object, in a storage unit; inputting a plurality of extraction rules, which are rules used to extract information from said extraction object document; respectively deriving extraction results matching each of said extraction rules from said extraction object document stored by said storage unit, using each of said extraction rules inputted; and creating a rule relation network indicating a relation between each of said extraction rules by analyzing an overlapping relation and including relation between extraction results derived and linking said extraction rules that the extraction results overlap or include, based on the result of the analysis; wherein said rule relation network derives an overlapping ratio indicating an overlapping relation between each of extraction results derived by said information extraction section, by analyzing an overlapping relation between said extraction results, and links corresponding extraction rules based on said overlapping ratio derived.
12. An information extraction rule making support method comprising: storing an extraction object document, which is an electronic document of an information extraction object, in a storage unit; inputting a plurality of extraction rules, which are rules used to extract information from said extraction object document; respectively deriving extraction results matching each of said extraction rules from said extraction object document stored by said storage unit, using each of said extraction rules inputted; and creating a rule relation network indicating a relation between each of said extraction rules by analyzing an overlapping relation and including relation between extraction results derived and linking said extraction rules that the extraction results overlap or include, based on the result of the analysis; wherein said rule relation network derives an overlapping ratio indicating an overlapping relation between each of extraction results derived by said information extraction section, by analyzing an overlapping relation between said extraction results, and links corresponding extraction rules based on said overlapping ratio derived. 14. The information extraction rule making support method as defined in claim 12 , wherein, when said rule relation network is created, corresponding extraction rules are linked only if there is any including relation between each of extraction results derived.