A data processing method includes acquiring first encoded data and second encoded data when receiving a request for data processing, the first encoded data being encoded in accordance with a first encoding rule, the second encoded data being encoded in accordance with a second encoding rule, specifying a first code relating to a second code in accordance with the first encoding rule and the second encoding rule without decoding the first encoded data and the second coded data, the first code being included in the first encoded data, the second code being included in the second encoded data and generating third encoded data in which the first code and the second code are stored in association with each other.