A base station that communicates with a mobile station includes: a storing unit for storing a predetermined number of base station information, each including a base station ID for discriminating a specific base station and parameter information for radio communications set for the specific base station; an acquisition unit for acquiring a base station ID of other base stations forming a destination cell of the mobile station, or a base station ID of other base station forming a source cell of the mobile station; an aggregating unit for aggregating the number of times that each of the base station IDs is acquired in a first time period; a determination unit for determining a priority of each of the base station IDs on the basis of the aggregated results of the acquisition numbers; a judging unit for judging whether or not there is a base station ID which has a priority higher than the base station ID stored in the storage, and whose acquisition number is larger than a predetermined number of times; and a manager for deleting, from the storage, a base station information including a base station ID having a priority lower than the base station ID judged to have a higher priority, and for storing, in the storage, a base station information including the base station ID judged as to have the higher priority, in a case where the judging unit judges there is the base station ID having a higher priority and whose acquisition number is larger.