A method for performing a remote firmware upgrade of a data collection device that takes into consideration the level of importance of a firmware upgrade according to the present invention is a method for upgrading a remote firmware between a firmware upgrade system including a device management server, a firmware distribution server, and an authentication server, A method of performing an upgrade, the method comprising: a first step of exchanging an authentication and an encryption key between the authentication server and the data collection device (DCU); A second step of preparing, by the device management server, a firmware upgrade operation; A third step of determining, by the device management server, whether a firmware upgrade importance level requested from the data collection device (DCU) is high; And a fourth step of performing an important firmware upgrade operation or a simple firmware upgrade operation according to a result of the determination whether the firmware upgrade importance level is high in the third process.
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