1. A method for supplementing product information, the method comprising, by a computer system: receiving a plurality of keywords; for each keyword of at least a portion of the plurality of keywords, obtaining a result set for the each keyword by searching a product taxonomy; obtaining a filtered set of keywords from the at least the portion of the plurality of keywords by filtering a set of keywords according to categories of result sets for the set of keywords, wherein the obtaining comprises, for the each keyword of the at least the portion of the plurality of keywords and the result set for the each keyword: evaluating a categorical similarity among products of the result set for the each keyword, wherein the evaluating comprises calculating a category consistency of the result set for the each keyword, and wherein the calculating comprises calculating the category consistency as n/(N-n), where n is a number of products in the result set for the each keyword and belonging to a most common category in categories represented in the result set for the each keyword and where N is a total number of products in the result set for the each keyword; assigning a score to the each keyword according to the categorical similarity; and filtering the at least the portion of the plurality of keywords according to scores assigned thereto to obtain the filtered set of keywords; and defining product groups for at least a portion of the filtered set of keywords, each product group having associated therewith a keyword from the filtered set of keywords and one or more products from the result set for the keyword from the filtered set of keywords.
7. The method of claim 1 , further comprising associating one or more product groups of the defined product groups with products of the product taxonomy.