A component-mounting system comprising: multiple component-mounting apparatuses in each of which multiple lanes (22a, 22b) capable of conveying multiple types of boards are arranged in parallel and that perform a mounting operation of picking up and holding supplied components and mounting the components on the boards, the multiple component-mounting apparatuses being arranged in a conveyance direction of the boards, and the multiple component-mounting apparatuses being configured to allow types of at least one of a production member (17, 51, 54) to be exchanged in accordance with the type of the board, the production member (17, 51, 54) including multiple types of component supply members for supplying different types of the components and multiple types of component holding members (51, 54) for holding different types of the components; a storage section (73, 83) configured to store group information in which the multiple types of boards are divided into groups, each of which allows the mounting operation of all types of boards of a group to be performed without requiring an operator to perform an exchange operation of exchanging the production members (17, 51, 54), an acquisition section configured to acquire the types of the boards on which the mounting operation is to be performed; a combination-determining unit configured to determine whether a combination of the types of the boards on which the mounting operation is to be performed in the multiple lanes (22a, 22b) is a combination that does not require the exchange operation of exchanging the production members (17, 51, 54) based on the types of the boards acquired by the acquisition section and the group information stored in the storage section (73, 83); characterized by: a loading controller configured to, when it is possible to convey the board in a first lane from one of the component-mounting apparatuses on an upstream side in the board conveyance direction to another of the component-mounting apparatuses on a downstream side and if the combination-determining unit has determined that a combination of the board that is possible to convey in the first lane and a board loaded into the component-mounting apparatus on the downstream side in a second lane is a combination that does not require the exchange operation of exchanging the production members (17, 51, 54), perform control so as to load the board that is possible to convey in the first lane into the component-mounting apparatus on the downstream side. multiple component-mounting apparatuses in each of which multiple lanes (22a, 22b) capable of conveying multiple types of boards are arranged in parallel and that perform a mounting operation of picking up and holding supplied components and mounting the components on the boards, the multiple component-mounting apparatuses being arranged in a conveyance direction of the boards, and the multiple component-mounting apparatuses being configured to allow types of at least one of a production member (17, 51, 54) to be exchanged in accordance with the type of the board, the production member (17, 51, 54) including multiple types of component supply members for supplying different types of the components and multiple types of component holding members (51, 54) for holding different types of the components; a storage section (73, 83) configured to store group information in which the multiple types of boards are divided into groups, each of which allows the mounting operation of all types of boards of a group to be performed without requiring an operator to perform an exchange operation of exchanging the production members (17, 51, 54), an acquisition section configured to acquire the types of the boards on which the mounting operation is to be performed; a combination-determining unit configured to determine whether a combination of the types of the boards on which the mounting operation is to be performed in the multiple lanes (22a, 22b) is a combination that does not require the exchange operation of exchanging the production members (17, 51, 54) based on the types of the boards acquired by the acquisition section and the group information stored in the storage section (73, 83); an acquisition section configured to acquire the types of the boards on which the mounting operation is to be performed; a combination-determining unit configured to determine whether a combination of the types of the boards on which the mounting operation is to be performed in the multiple lanes (22a, 22b) is a combination that does not require the exchange operation of exchanging the production members (17, 51, 54) based on the types of the boards acquired by the acquisition section and the group information stored in the storage section (73, 83); characterized by: a loading controller configured to, when it is possible to convey the board in a first lane from one of the component-mounting apparatuses on an upstream side in the board conveyance direction to another of the component-mounting apparatuses on a downstream side and if the combination-determining unit has determined that a combination of the board that is possible to convey in the first lane and a board loaded into the component-mounting apparatus on the downstream side in a second lane is a combination that does not require the exchange operation of exchanging the production members (17, 51, 54), perform control so as to load the board that is possible to convey in the first lane into the component-mounting apparatus on the downstream side.