A control device includes a cyclic communication part and a communication management part. The cyclic communication part controls communication of first control data and second control data. The first control data is control data of which arrival in a first guarantee time is guaranteed according to a preset cyclic period. In the second control data, arrival in a second guarantee time longer than the cyclic period is guaranteed and a sequence of information included is determined. When a data volume of second control data exceeds a communication volume for second control data based on the cyclic period, the communication management part divides the second control data into a plurality of communication data. The communication management part attaches an identifier indicating communication in a divided manner, a data volume, and a communication order to the plurality of communication data.