Provided is a program control device which switches, per timeslot, between threads to be executed. The program control device includes: a first interrupt creation unit which creates a first interrupt signal which designates a timeslot as a destination; and a first receiving unit which [i] does not receive the first interrupt signal if the timeslot as the destination is not a current timeslot, and [ii] receives the first interrupt signal if the timeslot as the destination is the current timeslot.