PURPOSE: To easily design and change decision making conditions while securing a large degree of freedom by providing a memory which stores a file whose primary and secondary conditions specifying the decision making conditions are set.

CONSTITUTION: The facility state monitor device 14 is equipped with a logic circuit 16 which performs logical operation as to whether or not state data that is stored in the unmanned truck state memory 15 and shows the state of an unmanned truck 101 meets the decision making conditions. The decision making condition setting memory 17 is stored with files which the decision making conditions are set by the decision making conditions. The decision making conditions are specified with an unmanned truck selection condition as the primary condition for narrowing down the state data for the 1st time and an unmanned truck observation condition as the 2nd condition for further narrowing down the narrowed-down state data. A logic circuit 16 selectively reads in a file out of the memory 17, decides whether or not an unmanned truck 101 meeting the unmanned truck selection condition meet the unmanned truck observation condition, file by file, and outputs the decision result.