The present invention relates to a method for extracting main keywords. The method includes the steps of: extracting words from documents to be analyzed, by using a text mining method; generating a document-word matrix by using the extracted words; generating a document-main component analysis matrix by using the document-word matrix generated in advance through a main component analysis; generating a regression model by using the document-main component analysis matrix; selecting the main component corresponding to a parameter with a significance probability (p-value) equal to or less than a first threshold value from the parameters of the generated regression model; and selecting one or more words in the selected main component as the main keywords. Accordingly, the present invention can objectively extract the main keywords, based on a statistical method.
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