A computer-implemented method for removing a duplicated web page, the method comprising: acquiring a plurality of web pages of a predetermined type; extracting a feature code of a current web page and a number of text characters contained in the current web page, extracting the feature code of the current web page comprising: acquiring paragraphs contained in the text of the current web page; for each paragraph, selecting a second pre-set number of text characters on the left and right sides of a central location of the paragraph; and generating the feature code by a calculation on a character string that combines all the selected text characters of the paragraphs, wherein when a number of characters in a paragraph is smaller than a pre-set first number, the feature code is supplemented with a corresponding number of pre-defined characters, and wherein the second pre-set number is half of the first pre-set number; looking up a data table to determine whether the feature code is contained in the data table; and after determining that the feature code is contained in the data table: reading a number of text characters of the web page referred to in the data table corresponding to the feature code, and discarding the current web page when a difference between the read number of text characters and the extracted number of text characters is within a range. acquiring a plurality of web pages of a predetermined type; extracting a feature code of a current web page and a number of text characters contained in the current web page, extracting the feature code of the current web page comprising: acquiring paragraphs contained in the text of the current web page; for each paragraph, selecting a second pre-set number of text characters on the left and right sides of a central location of the paragraph; and generating the feature code by a calculation on a character string that combines all the selected text characters of the paragraphs, wherein when a number of characters in a paragraph is smaller than a pre-set first number, the feature code is supplemented with a corresponding number of pre-defined characters, and wherein the second pre-set number is half of the first pre-set number; acquiring paragraphs contained in the text of the current web page; for each paragraph, selecting a second pre-set number of text characters on the left and right sides of a central location of the paragraph; and generating the feature code by a calculation on a character string that combines all the selected text characters of the paragraphs, wherein when a number of characters in a paragraph is smaller than a pre-set first number, the feature code is supplemented with a corresponding number of pre-defined characters, and wherein the second pre-set number is half of the first pre-set number; wherein when a number of characters in a paragraph is smaller than a pre-set first number, the feature code is supplemented with a corresponding number of pre-defined characters, and wherein the second pre-set number is half of the first pre-set number; looking up a data table to determine whether the feature code is contained in the data table; and after determining that the feature code is contained in the data table: reading a number of text characters of the web page referred to in the data table corresponding to the feature code, and discarding the current web page when a difference between the read number of text characters and the extracted number of text characters is within a range. reading a number of text characters of the web page referred to in the data table corresponding to the feature code, and discarding the current web page when a difference between the read number of text characters and the extracted number of text characters is within a range.