Provided are a method and an apparatus for controlling transmission power to remove symbol level interference when forming differentiated beams in a wireless system. A terminal, according to the present invention, may receive, from each of M resource blocks, M reference signals, and determine a power ratio between the reference signals and data signals for each of the M reference signals, wherein the beam width for each of the M reference signals may differ depending on the index of the resource blocks, and wherein the power ratio may be determined on the basis of beam width parameters corresponding to the index of the resource blocks.