A component preparation instruction system performs a component preparation instruction for preparing a reel member to be supplied to a component mounting line in an off-line set-up area set outside the component mounting line, in a component mounting system. The component preparation instruction system includes a management section that manages production data including information about the reel members and information about the component mounters to which the reel members is attached, a reading section that reads reel information relating to the reel members, a collating section that collates the reel information read by the reading section with the information about the reel members included in the production data, and an output section that outputs attachment position information for a matching reel member, including information about at least one component mounter to which the matching reel member is to be attached.
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