CONTROL DEVICE, CONTROL SYSTEM, AND PROGRAM

There are provided a control device, a control system, and a program that can improve position estimation precision. A control device includes a control section configured to obtain a distance measurement value, and estimate a relative position of the position changeable type communication device with respect to a target space based on the distance measurement value, the distance measurement value being obtained when a position fixed type communication device and the position changeable type communication device perform wireless communication, and indicating a distance between the position fixed type communication device and the position changeable type communication device, the position fixed type communication device being fixed to a position that is inside the target space, and is closer to a floor part than to a ceiling part of the target space, and the relative position of the position changeable type communication device with respect to the target space being changeable.