1. A parts mounting system that mounts electronic parts including a first part and a second part supplied from a plurality of parts makers on a board by referring to previously stored parts data, the system comprising:a parts check processing section that, in a loading work of the electronic parts or a parts mounting work by a parts mounting device, detects parts information which is identification information applied to an electronic part and includes a parts code for specifying a part of the electronic part and a parts maker code for specifying a parts maker of the electronic part and checks the detected parts information with parts information previously registered in a storing part;
wherein the first part has a parts code and a parts maker code, and the second part has a parts code and a parts maker code; and
a parts data generation section that, when the parts maker code of the first part is stored and registered on a first storing part and when the parts maker code of the second part is not stored and registered on a second storing part and the parts code of the second part is identical to the parts code of the first part, generates the parts maker code of the second part from parts data of the first part by reading the parts code of the second part,
wherein the generated parts maker code of the second part is newly registered and stored on the second storing part as information relating to the electronic parts.