The present invention relates to a method for allocating wireless resources in a wireless access system that supports an operation in an unlicensed band, as well as to an apparatus for the method. More particularly, a method for allocating wireless resources in a wireless access system that supports a television white space (TV WS) band comprises the steps of: allocating, to a terminal and from among TV WS bands, available frequency bands which are not used by a licensed device; if a receiving band of another device exists in a neighboring band of the available frequency bands, setting up a guard band in a portion of the band adjacent to the neighboring band from among the available frequency bands; allocating wireless resources to a terminal in a frequency band from among the available frequency bands, excluding the guard band; and receiving uplink data from the terminal through the wireless resources, wherein the guard band is determined using the allocation location of the wireless resources, the amount of wireless resources, and the transmission power of the terminal.