Show efficient conservative procedure. Alignment expedient (2) data gathering job lines up in the order whose processing precedence is high the data (5a) and the data (6a) of on the basis. As for matching expedient (3), the data which it matches to every classification of solution disposal, as the data gathering work preferentially of corresponding to particular solution disposal from the data gathering job whose use precedence of particular solution disposal is high the data (6a) on the basis of the number of matters, (8) it draws up. In order to execute the processing of data gathering job in the order whose processing precedence is high, it shows indicatory expedient (4), it assigns the condition which is prepared beforehand vis-a-vis the execution result of data gathering job it indicates the procedure which can end maintenance by the fact that the solution disposal which is matched to the data gathering work of executing when this condition is satisfied is executed.
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