A mounting system comprising: a component mounter configured to pick up components supplied from multiple component feeding units and mount the components on a board; a storage configured to store the component feeding unit; and a unit exchange device configured to automatically exchange the component feeding units between the component mounter and the storage, wherein the component feeding unit is provided with a specific component feeding unit that supplies specific components having the same component type and different characteristic ranks for each unit, and a related component feeding unit that supplies related components that are mounted in combination with the specific components, wherein the specific component is a light-emitting element having a different brightness rank as the characteristic rank, and the related component is a resistance element electrically connected to the light-emitting element, the mounting system further comprises a selection section configured to select a combination of the specific component feeding unit and the related component feeding unit from the component feeding unit stored in the storage based on combination information indicating a combination of a characteristic rank of the specific component and a component type of the related component corresponding to the characteristic rank, and storage information including the component type and a position and the component feeding unit stored in the storage and the characteristic rank of the specific component; and a control section configured to control the unit exchange device to take out the combination of the specific component feeding unit and the related component feeding unit from the storage and to convey the combination to the component mounter. a component mounter configured to pick up components supplied from multiple component feeding units and mount the components on a board; a storage configured to store the component feeding unit; and a unit exchange device configured to automatically exchange the component feeding units between the component mounter and the storage, wherein the component feeding unit is provided with a specific component feeding unit that supplies specific components having the same component type and different characteristic ranks for each unit, and a related component feeding unit that supplies related components that are mounted in combination with the specific components, wherein the specific component is a light-emitting element having a different brightness rank as the characteristic rank, and the related component is a resistance element electrically connected to the light-emitting element, the mounting system further comprises a selection section configured to select a combination of the specific component feeding unit and the related component feeding unit from the component feeding unit stored in the storage based on combination information indicating a combination of a characteristic rank of the specific component and a component type of the related component corresponding to the characteristic rank, and storage information including the component type and a position and the component feeding unit stored in the storage and the characteristic rank of the specific component; and a control section configured to control the unit exchange device to take out the combination of the specific component feeding unit and the related component feeding unit from the storage and to convey the combination to the component mounter.