An electronic component mounting system includes a component information change history storage unit that stores component information including operating parameters for numerical determination of an operation mode of an electronic component mounting operation unit and a change history of the component information, a mounting error recorder that detects a mounting error occurring during an electronic component mounting operation and records mounting error information relating to an occurrence situation of the mounting error, and a display unit that displays a transition of the mounting error on a screen of the display unit and reads past component information for designated date and time based on the designated date and time so that a correlation between change in the component information and the mounting error can be checked with ease and the component information including the operating parameter can be restored to a proper state.