CONTROL DEVICE, CONTROL METHOD, PROGRAM, AND RECORDING MEDIUM

A production line (10) includes a machine (A), a machine (B), a machine (C), a machine (D), and a control device (20), which perform processes in this order on a workpiece. The control device (20) includes: a monitoring section (21) for monitoring an amount of electric energy of the machine A between a point in time at which a power source of the machine (A) was turned on and a current point in time; and a power source control section (22) for switching a power source of the machine (B) from off to on when the amount of electric energy increases from a value being lower than a threshold value A to a value being not less than the threshold value A. This makes it possible to prevent wasteful electric power consumption in a line including a plurality of machines.