SECURITY DEVICE AND SECURITY METHOD

Provided is a security device in which a plurality of calculation units operating asynchronously can carry out a process without paying attention to synchronization between one system and another, and can execute a comparison process of output data of both systems without causing malfunction. This security device comprises: a plurality of calculation units that output a calculation result of input data for each control cycle as calculation data; a first comparison unit that compares information indicating the control cycle of the timing at which each of the plurality of calculation units outputs the calculation data; a plurality of temporary storage units that hold respective pieces of the calculation data output from the plurality of calculation units; a second comparison unit that compares the calculation data held by each of the plurality of temporary storage units; and an output unit that outputs the calculation data externally. Each of the plurality of temporary storage units outputs the calculation data held therein in accordance with the comparison result of the first comparison unit, and the output unit outputs externally the calculation data output from the temporary storage unit in accordance with the comparison result of the second comparison unit.