The invention provides an information processing method and an information processing device, and relates to the technical field of communication, used for accurately computing channel state information when a sending terminal or a receiving terminal has phase noise. The information processing method provided by the invention comprises the steps of sending pilot frequency signals of N ports to thereceiving terminal, wherein the pilot frequency signals of the N ports are distributed on M orthogonal frequency division multiplexing (OFDM) symbols; and sending phase tracking pilot frequency signals of the S ports to the receiving terminal, thus allowing the receiving terminal to perform phase compensation and determine the channel state information according to the pilot frequency signals ofthe N ports, the phase tracking pilot frequency signals of the S ports and a port corresponding relation acquired by the receiving terminal according to a predetermined mode.