A method for transmitting feedback information by a terminal may comprise the steps of: receiving, from a base station, information on a feedback group allocated to the terminal in a predefined feedback table; selecting a first feedback index in the allocated feedback group; and transmitting feedback information including the selected first feedback index to the base station, wherein the feedback table includes a plurality of feedback groups, the plurality of feedback groups in the feedback table include predetermined number of feedback indices, respectively, and the plurality of feedback groups in the feedback table have differently configured quantization level resolutions for the feedback information, respectively.