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.