There is provided an apparatus and a method of maintaining, repairing and/or optimizing a banknote validator using a network. The apparatus includes a banknote validator configured to count banknotes or determine genuineness or fitness of the banknotes, a wired or wireless network connection unit configured to relay or transmit one or more first data items and/or software, first data items and software updating, maintaining and/or repairing the banknote valuator and including security information, and a server configured to receive one or more second data items and software version information from the banknote validator and optionally transmit maintenance and repair results to the banknote validator through the wired or wireless network connection unit. The wired or wireless network connection unit may comprise a predetermined smart device or a web adjuster.