Abstract: There is provided in the present disclosure a server for providing feedback on a user's mark on a file, including: a transmitter, configured to transmit a file to be marked to a terminal of the user in response to a command for requesting the file by the user; a receiver, configured to receive a marked result of the user from the terminal; and a processor, configured to provide feedback on accuracy of the marked result of the user according to a reference factor; wherein the file is marked by the user based on at least one evaluation item, and the marked result includes a marked value corresponding to each of the at least one evaluation item.