Component mounting system and data creation device

A data creation device comprising:

• a storage section configured to be provided to each component mounter of a component mounter group in which multiple component mounters in which multiple component supply devices are detachably set in a pallet and configured to mount a component supplied by the component supply device on a mounting target are arranged along a conveyance direction of the mounting target, and to store multiple production jobs including information on what type of component is mounted on a board;
• and
• a grouping execution section configured to allocate, when grouping the multiple production jobs, production jobs having a degree of commonality in type of components included in each production job satisfying a predetermined determination criterion to the same group,
• wherein the group is set to perform an individual exchange of the component supply device without performing a collective exchange of the pallet of each component mounter when processing the production job belonging to the same group, and to perform the collective exchange of the pallet of each component mounter and not to perform the individual exchange of the component supply device when processing the production job belonging to different groups.