11. The server according to claim 10 , wherein the processor performs the program instructions to: obtain a uniform resource locator (URL) of the webpage from the visiting request; and obtain the keyword corresponding to the URL of the webpage from the text index pool.
11. The server according to claim 10 , wherein the processor performs the program instructions to: obtain a uniform resource locator (URL) of the webpage from the visiting request; and obtain the keyword corresponding to the URL of the webpage from the text index pool. 12. The server according to claim 11 , wherein the processor performs the program instructions to: determine whether the keyword corresponding to the URL of the webpage is included in the text index pool; and obtain the keyword if the keyword corresponding to the URL of the current webpage is included in the text index pool.