The present invention relates to a broadband wireless access system, and more particularly, to a method for an advanced mobile station to efficiently obtain information on a peripheral legacy base station in a mobile communication system in which a legacy system and an advanced system coexist. According to one embodiment of the present invention, the present invention provides a method for a mobile station to receive information on a peripheral base station from a serving base station that operates in a mixed mode in the mobile communication system in which the legacy system and the advanced system coexist, and the method comprises the steps of: receiving a second message that includes first time information for indicating a time when a first message is broadcasted, in a first region for the legacy system of the serving base station through a second region for the advanced system of the serving base station, and receiving the first message from the first region by using the first time information.