A terminal device configured to be connectable with a plurality of accessory devices and a server configured to store a firmware package, may include a processor, and a memory storing computer readable instructions that, when executed, cause the terminal device to perform functions. The functions may include a function of receiving the firmware package from the server, a function of storing the firmware package received from the server into the memory, a function of providing the stored firmware package to a first one of the plurality of accessory devices to install the firmware package therein, and a function of providing the stored firmware package to the other of the plurality of accessory devices to which the same firmware package is applied as the first one, to install the firmware package therein.