PURPOSE:To provide a mounting process optimizing method which reduces production time and prevents defective printed substrates by deciding an optimum line exactly. CONSTITUTION:(#2) In a plurality of mounting lines, each unit work time of all the mounting devices and a maximum unit work time excepting a mounting device are compared. (#3) When each unit work time of all the devices is smaller than a maximum unit work time excepting a mounting device, mounting speed is lowered until it is the largest in a range of a smaller unit work time than a maximum unit work time excepting a mounting device. (#4) When each unit work time of all the mounting devices is larger than a maximum unit work time excepting a mounting device or equal to it, unit work time is balanced minimum between mounting devices. (#5) A maximum unit work time among unit work time of the whole mounting facility of an intended mounting line is made a line tact. (#6) This is obtained for all the mounting lines. (#7) A line of a minimum unit work time is decided as an optimum mounting line by mounting process optimizing function.
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