An embodiment of the present invention relates to a method of reporting channel state information (CSI) of a terminal in which a plurality of CSI-reference resource (RS) configurations is set and includes: receiving information for quasi co-located assumption; measuring a channel state by using the CSI-RS; inducing a modulation and coding scheme (MCS) based on the measured result and the information for the QC assumption; and reporting the CSI including a CQI index associated with the MCS, wherein if there is a physical cell ID corresponding to the CSI-RS in the information for the QC assumption, the MSC is a value capable of receiving data below a certain error rate if the data, under the assumption of a cell-specific RS (CRS) transmitted from a cell of the physical cell ID and the QC, is received.