To simply and quickly consolidate program-controlled operations of a plurality of different working machines with one personal computer.

A sequence control device of each working machine is provided with a control program which selects an operational sequence, which corresponds to operational information with a model code as a key, to execute a sequence control operation. The personal computer is provided with a data-setting program which sets each operational information with model codes for each working machine, as the keys. Then, the control program of each working machine selects a preliminarily stored operational sequence, on the basis of the operational information with the model code thus set as the key, to execute a sequence control operation.

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