A maintenance terminal comprises a detected cell information collection unit that collects detected cell information including identification information of a handover original cell and identification information of a cell as an expected movement destination from a radio network controller, a detection count record unit that records the number of detection times that the relationship between the identification information of the handover original cell and the identification information of the cell as the detected expected movement destination is determined as not included in the relationship between the identification information of the handover original cell and the identification information of the adjacent cells recorded in the radio network controller, based on the collection of the detected cell information, and an adjacent cell information additional-registration unit that additionally registers the relationship between the identification information of the handover original cell and the identification information of the adjacent cells corresponding to the number of detection times in the adjacent cell information, when the number of detection times exceeds a threshold value.