Board work system, and method for managing mounting order of components in board work system

A board work system comprising:

• a plurality of component supply sections which supply components to be mounted on a circuit board;
• a die supply section which is one of the plurality of component supply sections, and supplies a die from a diced wafer to a supply position;
• a mounting head which is moved to the supply position to suction the die;
• and
• a control section which computes a required supply time which is required for the die supply section to supply the die to the supply position, based on an error occurrence rate determined at least one of division of a number of defective dies on the diced wafer which the die supply section supplies within a predetermined period during production of a plurality of circuit boards by a sum of a number of normal dies on the diced wafer and the number of defective dies and data related to the defective dies included in the wafer, determines whether the die supply section completes conveying the die to the supply position until the mounting head moves to the supply position based on the computed required supply time, and, if determining that the die supply section does not complete, decides or changes a mounting order of mounting the components including the dies on the circuit board.