A detection threshold changing unit changes a detection threshold used for detecting a reception wave from a base station apparatus, on the basis of use environment information that represents a use environment of a mobile station apparatus. A channel selecting unit selects a channel having a reception level higher than the detection threshold from among channels that constitute the reception wave. A synchronization processing unit performs a synchronization process on a reception wave of the channel selected by the channel selecting unit. In this way, the processing time and power consumption related to a cell search is reduced.