An electronic component mounting system includes a screen printing device, an inspection device, an electronic component mounting device, a feedback part that generates, based on inspection data formed by the inspection device, first information about corrections on control parameters pertinent to positioning of a mask to a substrate in the screen printing device, and a feedforward part that generates, based on the inspection data, second information about corrections on electronic component mount coordinates in the electronic component mounting device. The feedback part generates the first information based on the first print displacement value. The feedforward part generates the second information based on the second print displacement value.