The present disclosure aims to provide a core node capable of appropriately allocating a radio resource of a RAN Slice allocated for a specific service to a radio terminal that uses this specific service. A core node (10) according to the present disclosure includes: a determination unit (14) configured to determine a radio resource to be allocated in accordance with a service provided for a radio terminal (30) and a communication unit (12) configured to transmit resource identification information indicating the radio resource determined in the determination unit (14) to a base station (20) that manages a plurality of radio resources for each RAN Slice associated with a service.