Disclosed in the present application is a method by which a terminal reports channel state information (CSI) to a base station in a wireless communication system. Specifically, the method comprises the steps of: calculating a first CSI as to compare the same with CSI which has been most recently reported; reporting the first CSI to a base station if the calculated first CSI is not the same as the CSI which has been most recently reported; and reporting a second CSI to the base station if the calculated first CSI is the same as the CSI which has been most recently reported, wherein the second CSI is CSI calculated on the basis of the assumption that interference affecting a terminal has been removed.