SUPPORT DEVICE AND SUPPORT PROGRAM

Provided is an environment that can effectively supports development of a sequence program. A support device that supports the development of a sequence program deploys, when the sequence program is displayed, a call instruction of a unit program for configuring the sequence program to a circuit represented by a sequence logic defined by the unit program and displays the circuit, and changes, in accordance with an operation of changing the circuit, the sequence logic of the circuit. When the sequence program is converted into executable code, the support device assigns, to the call instruction in the sequence program, either code of the sequence logic thus changed or code of the call instruction in accordance with a switching option.