2. The system according to claim 1 , wherein the related keyword information of the product database further comprises the number of recent update for each related keyword.
2. The system according to claim 1 , wherein the related keyword information of the product database further comprises the number of recent update for each related keyword. 3. The system according to claim 2 , wherein the algorithm further comprises deleting information for related keywords that have low first priority values and low number of recent updates with respect to said individual product.