A communication method of a coordinator in a Wireless Local Area Network, WLAN, the method comprising: receiving, from a source station, a relay search request frame for requesting a search for at least one relay station between a destination station and a source station; transmitting, to the source station in response to the relay search request frame, a relay search response frame including a list comprising the at least one relay station so that the source station selects a target relay station from the at least one relay station; assigning a resource for performing beamforming in a link between the source station and the at least one relay station included in the list and a link between the destination station and the at least one relay station included in the list; receiving, from the source station, a resource request for performing beamforming in a link between the source station and the destination station after the source station obtained information associated with a result of the beamforming performed in the link between the at least one of the relay stations and the source station and the link between each of the at least one relay station and the destination station, and responding to the resource request; and broadcasting, to the source station and the destination station, information associated with a resource assigned to the link between the source station and the destination station, wherein the relay search request frame comprises a category field for setting a range of a millimeter wave used in the WLAN an action field for setting a value indicating a corresponding frame is the relay search request frame, a dialog token field set to a value selected by the source station transmitting the relay search request frame in order to identify a transaction between a search request for the at least one relay station and a corresponding response, and a destination station AID field for setting an AID for the destination station, and wherein the relay search response frame comprises a category field for setting a range of a millimeter wave used in the WLAN an action field for setting a value indicating a corresponding frame is the relay search response frame corresponding to the relay search request frame, a dialog token field for setting a value about the relay search request frame used to generate the relay search response, and a relay capable station info field denoting information associated with the corresponding relay station. receiving, from a source station, a relay search request frame for requesting a search for at least one relay station between a destination station and a source station; transmitting, to the source station in response to the relay search request frame, a relay search response frame including a list comprising the at least one relay station so that the source station selects a target relay station from the at least one relay station; assigning a resource for performing beamforming in a link between the source station and the at least one relay station included in the list and a link between the destination station and the at least one relay station included in the list; receiving, from the source station, a resource request for performing beamforming in a link between the source station and the destination station after the source station obtained information associated with a result of the beamforming performed in the link between the at least one of the relay stations and the source station and the link between each of the at least one relay station and the destination station, and responding to the resource request; and broadcasting, to the source station and the destination station, information associated with a resource assigned to the link between the source station and the destination station, wherein the relay search request frame comprises a category field for setting a range of a millimeter wave used in the WLAN an action field for setting a value indicating a corresponding frame is the relay search request frame, a dialog token field set to a value selected by the source station transmitting the relay search request frame in order to identify a transaction between a search request for the at least one relay station and a corresponding response, and a destination station AID field for setting an AID for the destination station, and wherein the relay search response frame comprises a category field for setting a range of a millimeter wave used in the WLAN an action field for setting a value indicating a corresponding frame is the relay search response frame corresponding to the relay search request frame, a dialog token field for setting a value about the relay search request frame used to generate the relay search response, and a relay capable station info field denoting information associated with the corresponding relay station.