If the time to transition to another reinforcement treatment by detecting the termination of one reinforcement treatment can be shortened as disclosed in patent document 1, the progress state of the reinforcement treatment cannot be known. Thus, what timing fusion splicer work is to be performed at cannot be determined and the fiber work is advanced consecutively regardless of the progress state of the reinforcement treatment or is executed each time the termination of the reinforcement treatment is detected. The former results in accumulation of a large number of fiber optical splicer waiting for being reinforced and the latter results in an increase in the total work time. If a plurality of reinforcement treatment devices are included, a similar result occurs unless the progress state of each reinforcement treatment device like fiber connecter can be known individually; it is difficult to set efficient work allocation.