An apparatus and method for treating a surface to definitely finish an object to be machined with high quality are achieved. In the step of a first check, the number of objects (W) that are brought into the areas (20A, 42A, 74A) in which the steps of pre-cleaning, shot peening and post-cleaning are carried out are counted and the nature of the surfaces the objects are detected. In the step of a second check, the number of objects (W) brought out of the areas is counted and the nature of the surfaces of the objects is detected.
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