Abstract: A processing program analyzer analyzes a processing program and extracts first and second codes included in the processing program and indicating a joint-constituting pair of a first endpoint of a cutting path on a laser cutting start side and a second endpoint of a cutting path on a laser cutting end side. A joint information adder adds joint information indicating the position of at least one of the first code and the second code to the processing program. A joint compensation amount generator generates a joint compensation amount to be set for a joint to be increased or decreased in a joint amount. A transmitter transmits to an NC device the processing program to which the joint information has been added and the joint compensation amount associated with information indicating the joint to be increased or decreased in the joint amount.