A method for supporting handover in a wireless access system supporting a dual connectivity mode, the method comprising: receiving (S1 101), by a source primary cell, a measurement report message from a user equipment, UE, wherein the UE maintains connections to both the source primary cell and a small cell in the dual connectivity mode at the same time; characterized by: transmitting, by the source primary cell to a target primary cell, a handover request message including mobility information indicating a movement speed of the UE and small cell maintenance request information, wherein the small cell maintenance request information includes a small cell identifier of the small cell; determining, by the target primary cell, whether or not to maintain the connection to the small cell based on the small cell maintenance request information when the movement speed of the UE is equal to or less than a threshold value; receiving, by the source primary cell from the target primary cell, a handover request acknowledgement message including small cell maintenance response information including a small cell identifier determined by the target primary cell, wherein the small cell maintenance request information is information for requesting maintenance of the dual connectivity mode for the small cell to support the handover, wherein the small cell maintenance response information indicates whether the target primary cell is capable of maintaining the dual connectivity mode for the small cell. receiving (S1 101), by a source primary cell, a measurement report message from a user equipment, UE, wherein the UE maintains connections to both the source primary cell and a small cell in the dual connectivity mode at the same time; characterized by: transmitting, by the source primary cell to a target primary cell, a handover request message including mobility information indicating a movement speed of the UE and small cell maintenance request information, wherein the small cell maintenance request information includes a small cell identifier of the small cell; determining, by the target primary cell, whether or not to maintain the connection to the small cell based on the small cell maintenance request information when the movement speed of the UE is equal to or less than a threshold value; receiving, by the source primary cell from the target primary cell, a handover request acknowledgement message including small cell maintenance response information including a small cell identifier determined by the target primary cell, wherein the small cell maintenance request information is information for requesting maintenance of the dual connectivity mode for the small cell to support the handover, wherein the small cell maintenance response information indicates whether the target primary cell is capable of maintaining the dual connectivity mode for the small cell. transmitting, by the source primary cell to a target primary cell, a handover request message including mobility information indicating a movement speed of the UE and small cell maintenance request information, wherein the small cell maintenance request information includes a small cell identifier of the small cell; determining, by the target primary cell, whether or not to maintain the connection to the small cell based on the small cell maintenance request information when the movement speed of the UE is equal to or less than a threshold value; receiving, by the source primary cell from the target primary cell, a handover request acknowledgement message including small cell maintenance response information including a small cell identifier determined by the target primary cell, wherein the small cell maintenance request information is information for requesting maintenance of the dual connectivity mode for the small cell to support the handover, wherein the small cell maintenance response information indicates whether the target primary cell is capable of maintaining the dual connectivity mode for the small cell.