A technology is disclosed that provides a handover preprocessing system and the like, the handover preprocessing system capable of eliminating waste of resources used as a result of notification being reissued of a CSG cell for which access is not granted. According to the technology, the handover preprocessing system is configured by: a base station 100 that is an object for connection of a mobile terminal 300, provides a plurality of cells indicating a range accessible by the mobile terminal, and transmits, to the mobile terminal, notification information including frequency information of each cell; the mobile terminal that verifies access permission for the cells based on the notification information received from the base station and, when access permission is not granted, generates a first message including frequency information corresponding to the cell for which access permission is not granted and transmits the first message to a connecting base station 200 to which the mobile terminal itself is currently connected; and the connecting base station that transmits, to the mobile terminal, a second message including a command giving an instruction to select a frequency other than a frequency specified by the frequency information included in the first message, based on the first message received from the mobile terminal.