[Problem] To provide a device and method with which it is possible to suppress the occurrence of unnecessary operations in the case of a Secondary Cell Group (SCG) bearer. [Solution] This device is provided with: a communication processing unit for communicating with a terminal device on a Master Cell Group (MCG) bearer for dual connectivity of the terminal device; a request unit for requesting asecondary base station, which communicates with the terminal device on the SCG bearer for the dual connectivity, to report activity-related information relating to activity of the terminal device in the SCG of the secondary base station; and an information acquisition unit for acquiring the activity-related information reported by the secondary base station.