Electronic-component mounting system

A second wireless communication unit (11) in a handheld information terminal (6) receives identifying information in the form of radio signals emitted by mounting devices (M3-M5) that are part of mounting lines (2). If there are a plurality of radio signals that exceed a given threshold, a processing unit (14) in the handheld information terminal (6) identifies the mounting device (M3-M5) (or mounting line (2)) emitting the strongest radio signal as the mounting device (M3-M5) (or mounting line (2)) closest to the handheld information terminal (6). The processing unit (14) then displays single mounting-device data (50) containing operating-quality information corresponding to the identified mounting device (M3-M5) (or single mounting-line data (30) containing operating-quality information corresponding to the identified mounting line (2)) on a display screen (12a).