1. A method for detecting an effective section of a gesture, the method comprising: acquiring, by a controller, an image that includes the gesture and a background; extracting, by the controller, pose information and motion information included in the gesture as features; determining, by the controller, whether a pose has been recognized based on the pose information; in response to determining that a pose has been recgonized, detecting, by the controller, the effective section of the gesture based on a start point and an end point of the pose; and in response to detecting the effective section of the guesture, recognizing, by the controller, the gesture based on the motion information, wherein the detecting of the effective section of the gesture includes: detecting, by the controller, the start point of the pose; detecting, by the controller, the end point of the pose; determining, by the controller, whether the section from the start point to the end point continues for a predetermined time or more; and in respond to determining that the section continues for the predetermined time or more, determining, by the controller, the section between the start point to the end point as the effective section.