Provided is a control device which controls at least one of unmanned vehicles forming a group of unmanned vehicles that includes one vehicle, the control device acquires information on a state of another vehicle, calculates comparison values for plural kinds of actions by using acquired information on the one vehicle and the another vehicle, selects an action that the one vehicle is to take, based on comparison values for the plural kinds of actions, calculates an operation amount of the one vehicle by using information on an selected action and acquired information on a state of the another vehicle, and sets an operation setting value of an actuator for operating the one vehicle by using the calculation result.