Abstract: A controller includes a setting information storage unit that stores at least a folder search priority order setting defining an order of priority in which folders are searched when a program is called, a call information storage unit that stores call information, which is information relating to a correspondence relationship between a call source program and a call destination program among programs stored in advance in a program storage unit, a call information generation unit that generates call information when there is a possibility that the correspondence relationship between the programs has changed, and a call information determination unit that determines whether or not the correspondence relationship between the programs has changed by comparing the call information generated by the call information generation unit with the call information stored in the call information storage unit.