Abstract: A programmable controller (PC) which converts PC instructions directly into targeted CPU instructions, not into a macroprogram format, and stores them as an execution file. The PC stores restoration information for ladder display together with the CPU instructions, whereby the number of program steps to be executed is reduced and a ladder display can be provided. The PC also converts PC instructions written in the ladder language into restoration information restorable to the ladder language and generates them as a main processing restoration information file, then converts the PC instructions directly into targeted CPU instructions, not into a macroprogram format, on the basis of the restoration information file, and stores them as an execution file independently of the main processing restoration information file.