A base station device 10b that communicates wirelessly with a mobile terminal, including: an accepting portion that determines whether to be capable of accepting handover from another base station device 10a to the base station device 10b; a determination portion that, when the accepting portion determines to be capable of accepting the handover (S18), determines whether to aggregate or separate bearers set between the another base station device 10a and the mobile terminal 12; and a notifying portion that notifies the mobile terminal 12 of a determination result of aggregation or separation of the bearers (S22-S28).
