An artificial intelligence device for providing a speech recognition function includes a memory configured to store a basic wake-up word used to activate the speech recognition function of the artificial intelligence device and an additional wake-up word used to control operation of the artificial intelligence device, a microphone configured to receive a speech command, and a processor configured to determine whether a current situation is an additional wake-up word recognition situation when the basic wake-up word is recognized from the speech command and perform operation corresponding to the remaining command excluding the basic wake-up word from the speech command upon determining that the current situation is the additional wake-up word recognition situation.