“A mobile station that includes a measurement information storage unit configured to store a measurement rule and a measurement object in association with each other; a measurement unit to perform a measurement of a radio quality in an inter-frequency cell using a frequency defined by the measurement object stored in the measurement information storage unit; a measurement report transmitter unit configured to transmit a measurement report to a radio base station, when determining that a determination condition defined by the measurement rule associated with the measurement object is satisfied on the basis of the measurement result of the radio quality; and a handover processor unit configured to perform an inter-frequency handover in response to an instruction from the radio base station. The measurement information storage unit is configured to change the association between the measurement rule and the measurement object, when the inter-frequency handover is performed.”