7. An attribute extraction system, comprising: a document storage having documents stored therein; an attribute group extracting section, implemented by a processor, configured to extract the document including an input word inputted by a user from said document storage, delimits said extracted document into strings or images based upon a predetermined rule, and calculates a drawing position of each of said delimited strings or images, and extracts a group of the strings or images of which said calculated drawing positions are arranged in one direction as an attribute group; an attribute name group selector, implemented by the processor, configured to calculate an attribute name score indicative of an extent to which said attribute group is an aggregation of attribute names based upon a statistical index employing the appearance number of each word in all of the attribute groups that is obtained from said delimited strings or images of said attribute group, and selects an attribute name group from said attribute group based upon said attribute name score; and an attribute extracting section, implemented by the processor, configured to select, from said extracted attribute group, the attribute group in which the strings or images identical to said delimited strings or images of said attribute name group are contained, and the drawing position of the above identical string or image is identical to that of said attribute name group, and extracts au attribute name from the strings or images of which the drawing position is identical between said attribute name group and said selected attribute group, and extracts an attribute value corresponding to said extracted attribute name from the strings or images of the said selected attribute group except for the string or image corresponding to said extracted attribute name.
12. The attribute extraction system according to claim 7 , further comprising: an input word extracting section, implemented by the processor, configured to extract a second input word belonging to a category identical to that of said input word from the strings or images of the attribute group in which said input word is contained in the string or image.