An electronic component system includes an electronic component mounting line mounting an electronic component on a board (exposure managing board) for which management of exposure time is necessary, a package ID reader (recognition unit) which recognizes a package code (identification information) that is applied to a package bag, and a storage unit which stores an exposure time limit which is permissible from an open time before reaching a management release in which management of the exposure time is unnecessary. In the electronic component mounting system, the package code is read while the package bag is open, the read time is stored as the open time, an expected duration is calculated which is necessary from a predetermined point of time before reaching the management release, and it is determined whether or not the exposure time limit is exceeded before the board which is exposed in the atmosphere reaches the management release.