An information processing unit, such as a mobile phone, equipped with a fingerprint sensor and reconciles size reduction with operability at a high level. The electronic control apparatus has a configuration which makes it possible to correctly and reliably rewrite the control software for each of these microcomputers in succession. The apparatus includes a cover having a top portion and opposed first and second sides extending downwardly therefrom. The nozzle for the vacuum is advantageous in that it can easily suck dusts scattered during cleaning.