The invention discloses a data processing method and a data processing device. The method comprises the steps that a data packet extraction instruction is received, wherein the data packet extraction instruction comprises at least two groups of user tags and relational operation between the user tags; a corresponding tag file is screened out of a data list according to each user tag, wherein the tag file comprises user numbers corresponding to the user tags; the user numbers in the tag file are divided into multiple number segments; and operation is performed on the user numbers in the same number segment according to the relational operation to generate a hit data packet. According to the method, an index file is established for the tag file and is subjected to relational operation, and therefore time complexity of operation is lowered; moreover, multi-thread or multi-process joint execution is supported, so that processing speed is further increased.