CONTROL DEVICE, CONTROL METHOD, AND COMPUTER PROGRAM

A control device according to this disclosure includes: a communication unit configured to communicate with an on-vehicle control device via an in-vehicle communication line; and a control unit configured to control the communication unit. The control unit executes: an acquisition process of acquiring a first time and a second time described below; and a determination process of determining, based on a result of comparison between the first time and the second time that have been acquired, whether or not rollback to a control program before update is necessary in the on-vehicle control device that is updating the control program. First time: a time from a present time in which the control program is being updated to when the update is completed Second time: a time from the present time to when the rollback to the control program before update is completed