The invention discloses a processing method for repeating data. The method comprises the steps as follows: an inquiry request is received from a client, and the inquiry request comprises a finger-print value inquiry; a hash block corresponding to a requested finger-print value in an internal memory is utilized to search the requested finger-print value; and when the requested finger-print value is not contained in the hash block corresponding to the requested finger-print value, steps are performed as follows: the requested finger-print value is searched in a newly-adding list in the internal memory, and invalid repeating information is sent to the client when the requested finger-print value is contained in the newly-adding list.