PURPOSE: To precisely analyze a factor, etc., for generating the fluctuation and lowering of the working rate of a line even for a line such as the random floating mode of many kinds in small quantities.

CONSTITUTION: When the product waiting time Ta (N) of a facility in use is shorten that the product waiting time Ta (N+1) of succeeding facility, it is judged that a certain factor to shorten the product waiting time Ta is generate and offset waiting time analysis processing is executed (S240), and a waiting time offset component is distributed to a facility cycle time difference effective component TBS and a buffer effective component TBB. Meanwhile, when the time Ta (N+1) is longer than the time Ta (N), it is judged that the product waiting time Ta (N+1) of the succeeding facility is prolonged due to the certain factor generated in its own facility, and increment waiting time analysis processing is executed (S250), and a waiting time increment component is distributed to facility cycle time difference TX and inter-facility loss time TY.