In a programmable controller system, a program display device includes: a command name conversion table; a second conversion unit that receives a program list from a programmable controller and converts a command number described in the program list into a command name on the basis of a command name conversion table; a non-corresponding command name acquisition unit that acquires a command name corresponding to a non-corresponding command number among the command numbers described in the program list on the basis of an additional command information table; and a display unit that displays the command name converted by the second conversion unit and the command name acquired by the non-corresponding command name acquisition unit.