11. A non-transitory computer readable medium, which stores a program to be used in a knowledge extracting apparatus for extracting knowledge information related to stock transactions from pieces of distributed news information, which knowledge extracting apparatus includes a storage section, the program causing the knowledge extraction apparatus to function as: an information receiving section for receiving the pieces of information; an information selecting section for selecting a piece of news information including economic terms from the pieces of news information thus received; a knowledge extracting section for extracting the knowledge information from the news information thus selected and writing the knowledge information into the storage section; and an information analysis section for, after the knowledge information is written, analyzing all the pieces of news information thus received by the information receiving section, based on the knowledge information thus stored in the storage section; wherein the knowledge extracting section includes: a share-price-fluctuation evaluation word judging section for judging whether or not the news information thus selected includes a share-price-fluctuation evaluation word to evaluate a share price fluctuation; a group definition word judging section for judging whether or not the news information includes a group definition word to define a group name of an issue when the news information includes the share-price-fluctuation evaluation word as a result of the judgment; a group name extracting section for extracting a group name from the news information based on the group definition word when the news information includes the group definition word as a result of the judgment; an issue extracting section for extracting an issue including a company name and a securities code from the news information when the news information includes the share-price-fluctuation evaluation word as a result of the judgment by the share-price-fluctuation evaluation word judging section; an element extracting section for extracting a share-price-fluctuation element from the news information when the news information includes the share-price-fluctuation evaluation word as a result of the judgment by the share-price-fluctuation evaluation word judging section; a combination forming section for combining the group name, the issue, and the share-price-fluctuation element thus extracted so as to forms the knowledge information; and a writing section for writing the knowledge information thus formed into the storage section, wherein the knowledge information is information including the group name, the issue, and the share-price-fluctuation element, or information including first information constituted by the group name and the issue and second information constituted by the share-price-fluctuation element.
11. A non-transitory computer readable medium, which stores a program to be used in a knowledge extracting apparatus for extracting knowledge information related to stock transactions from pieces of distributed news information, which knowledge extracting apparatus includes a storage section, the program causing the knowledge extraction apparatus to function as: an information receiving section for receiving the pieces of information; an information selecting section for selecting a piece of news information including economic terms from the pieces of news information thus received; a knowledge extracting section for extracting the knowledge information from the news information thus selected and writing the knowledge information into the storage section; and an information analysis section for, after the knowledge information is written, analyzing all the pieces of news information thus received by the information receiving section, based on the knowledge information thus stored in the storage section; wherein the knowledge extracting section includes: a share-price-fluctuation evaluation word judging section for judging whether or not the news information thus selected includes a share-price-fluctuation evaluation word to evaluate a share price fluctuation; a group definition word judging section for judging whether or not the news information includes a group definition word to define a group name of an issue when the news information includes the share-price-fluctuation evaluation word as a result of the judgment; a group name extracting section for extracting a group name from the news information based on the group definition word when the news information includes the group definition word as a result of the judgment; an issue extracting section for extracting an issue including a company name and a securities code from the news information when the news information includes the share-price-fluctuation evaluation word as a result of the judgment by the share-price-fluctuation evaluation word judging section; an element extracting section for extracting a share-price-fluctuation element from the news information when the news information includes the share-price-fluctuation evaluation word as a result of the judgment by the share-price-fluctuation evaluation word judging section; a combination forming section for combining the group name, the issue, and the share-price-fluctuation element thus extracted so as to forms the knowledge information; and a writing section for writing the knowledge information thus formed into the storage section, wherein the knowledge information is information including the group name, the issue, and the share-price-fluctuation element, or information including first information constituted by the group name and the issue and second information constituted by the share-price-fluctuation element. 12. The non-transitory computer readable medium according to claim 11 , wherein: the knowledge information has a hierarchical structure constituted by broader-concept information and narrower-concept information; and the storage section stores evaluation information and a certainty factor indicative of how much the narrower-concept information belongs to the broader-concept information, the program causing the knowledge extracting apparatus to function as: an evaluation section for calculating an evaluation value based on the evaluation information associated with the broader-concept information and the narrower-concept information; and a certainty factor update section for updating the certainty factor based on the evaluation value.