A PHS terminal device has first and second checking mechanisms, first and second starting mechanisms, a first storing mechanism, first confirming mechanism, and processing mechanism. The first checking mechanism executes a first check to determine detection of a Unique Word when receiving a time slot and outputs a first interrupting signal upon detection. The first starting mechanism starts a first interrupting routine in response to the first interrupting signal. The first storing mechanism stores the first check result. The second checking mechanism executes a second check determining whether reception of the time slot is completed and outputs a second interrupting signal when reception of the time slot is completed, and the second starting mechanism starts a second interrupting routine in response. The first confirming mechanism confirms the first check result. The processing mechanism executes data processing of the time slot according to the confirmation result of the second interrupting routine.