1. A related text comparison system stored in a non-transitory computer readable medium, comprising: a first collection of data including a plurality of first text pages, each of the first text pages including a plurality of words, each of the first text pages being characterized as one of a directory page and a content page, each of the directory page including a reference to one or more of the first text pages, a first directory page being selected from the first collection as a base directory, the based directory having a first reference to a first content page being selected from the base directory as a base page, the first reference including a category name for the base directory; a second collection of data including a plurality of second text pages, each of the second text pages including a plurality of words, each of the second text pages being characterized as one of a second directory page and a content page, each of the second directory page including a reference to one or more of the second text pages; and a related page specifying unit for receiving the category name of the base page and parsing the second collection of data to specify one of the second directory page by matching the category name to the specified directory as a compare directory, the compare directory referencing one or more content pages from the second collection of data as compare pages, wherein the compare pages are determined to be related to the base page, wherein further comprising: a word information unit for parsing the base page and the compare pages to determine a degree of comparison between the base page and each of the compare pages, wherein the word information unit produces a topic structure TS={t 1 . . . t i . . . t n } consisting of a set of topics t i for each of the base page and the compare pages, each t i including a set of subject words s i and a set of content words C i , wherein a word (t) from a given text page tf(t) can be considered as a subject word s i from the set of subject words based on an objective measure, the objective measure being a product of frequency of appearance of the word (t) in the given text page tf(t) and a weighting factor weight(t) according to part of speech of the word (t), and the word (t) being considered a subject word s i when the product exceeds a threshold value α, the product being expressed as: 
 tf ( t )×weight( t )>α.
1. A related text comparison system stored in a non-transitory computer readable medium, comprising: a first collection of data including a plurality of first text pages, each of the first text pages including a plurality of words, each of the first text pages being characterized as one of a directory page and a content page, each of the directory page including a reference to one or more of the first text pages, a first directory page being selected from the first collection as a base directory, the based directory having a first reference to a first content page being selected from the base directory as a base page, the first reference including a category name for the base directory; a second collection of data including a plurality of second text pages, each of the second text pages including a plurality of words, each of the second text pages being characterized as one of a second directory page and a content page, each of the second directory page including a reference to one or more of the second text pages; and a related page specifying unit for receiving the category name of the base page and parsing the second collection of data to specify one of the second directory page by matching the category name to the specified directory as a compare directory, the compare directory referencing one or more content pages from the second collection of data as compare pages, wherein the compare pages are determined to be related to the base page, wherein further comprising: a word information unit for parsing the base page and the compare pages to determine a degree of comparison between the base page and each of the compare pages, wherein the word information unit produces a topic structure TS={t 1 . . . t i . . . t n } consisting of a set of topics t i for each of the base page and the compare pages, each t i including a set of subject words s i and a set of content words C i , wherein a word (t) from a given text page tf(t) can be considered as a subject word s i from the set of subject words based on an objective measure, the objective measure being a product of frequency of appearance of the word (t) in the given text page tf(t) and a weighting factor weight(t) according to part of speech of the word (t), and the word (t) being considered a subject word s i when the product exceeds a threshold value α, the product being expressed as: 
 tf ( t )×weight( t )>α. 6. The system of claim 1 , wherein the word information unit determines a degree of comparison between a paragraph in the base page and each paragraph in each of the compare pages.