A method for transmitting a signal in a transmitting stage of a wireless communication system which forms a plurality of beams, the method comprising: transmitting, to a receiving stage, a signal by using a first transmission beam; transmitting, to a receiving stage, a plurality of reference signals through a plurality of transmission beams, wherein the plurality of reference signals comprises beam identifier information, load information and at least one of cell ID information and sector ID information of the plurality of transmission beams; receiving, from the receiving stage, channel information for at least one transmission beam among the plurality of transmission beams, wherein the channel information is estimated based on reference signal of the at least one transmission beam; selecting a second transmission beam among the at least one transmission beam for transmitting a signal to the receiving stage, by considering the channel information and load information of the at least one transmission beam; and determining whether the first transmission beam is changed to the selected second transmission beam, based on beam ID information and at least one of cell ID information and sector ID information of the first transmission beam and the second transmission beam, wherein the determining whether the first transmission beam is changed to the selected second transmission beam comprises: comparing ID information of the first transmission beam and ID information of the second transmission beam; when the selected transmission beam has a same cell ID and a same sector ID as first transmission beam, changing the beam to the selected transmission beam for the receiving stage; when the selected transmission beam has the same cell ID and a different sector ID than the first transmission beam, performing an inter-sector handover to the selected transmission beam for the receiving stage; and when the selected transmission beam has a different cell ID than the first transmission beam, performing an inter-cell handover to the selected transmission beam for the receiving stage; wherein the cell ID information indicates an ID of a cell in which the second transmission beam is included, and wherein the sector ID information indicates an ID for each of a plurality of sectors composing the cell. transmitting, to a receiving stage, a signal by using a first transmission beam; transmitting, to a receiving stage, a plurality of reference signals through a plurality of transmission beams, wherein the plurality of reference signals comprises beam identifier information, load information and at least one of cell ID information and sector ID information of the plurality of transmission beams; receiving, from the receiving stage, channel information for at least one transmission beam among the plurality of transmission beams, wherein the channel information is estimated based on reference signal of the at least one transmission beam; selecting a second transmission beam among the at least one transmission beam for transmitting a signal to the receiving stage, by considering the channel information and load information of the at least one transmission beam; and determining whether the first transmission beam is changed to the selected second transmission beam, based on beam ID information and at least one of cell ID information and sector ID information of the first transmission beam and the second transmission beam, wherein the determining whether the first transmission beam is changed to the selected second transmission beam comprises: comparing ID information of the first transmission beam and ID information of the second transmission beam; when the selected transmission beam has a same cell ID and a same sector ID as first transmission beam, changing the beam to the selected transmission beam for the receiving stage; when the selected transmission beam has the same cell ID and a different sector ID than the first transmission beam, performing an inter-sector handover to the selected transmission beam for the receiving stage; and when the selected transmission beam has a different cell ID than the first transmission beam, performing an inter-cell handover to the selected transmission beam for the receiving stage; comparing ID information of the first transmission beam and ID information of the second transmission beam; when the selected transmission beam has a same cell ID and a same sector ID as first transmission beam, changing the beam to the selected transmission beam for the receiving stage; when the selected transmission beam has the same cell ID and a different sector ID than the first transmission beam, performing an inter-sector handover to the selected transmission beam for the receiving stage; and when the selected transmission beam has a different cell ID than the first transmission beam, performing an inter-cell handover to the selected transmission beam for the receiving stage; wherein the cell ID information indicates an ID of a cell in which the second transmission beam is included, and wherein the sector ID information indicates an ID for each of a plurality of sectors composing the cell.