A refrigerator comprising: a cabinet defining a storage space; a door for opening and closing the cabinet ; a transparent display assembly which covers an opened see-through part of the door , being configured to selectively allow an inner space of the refrigerator to be seen by outputting an initial screen ; a display PCB configured for controlling an operation of the transparent display assembly ; a voice recognition unit configured to process a user's voice signal; and a microphone for receiving a user's voice input, being connected to the voice recognition unit , characterized in that : the display PCB is configured to, according to the user's voice signal, output various screens on the transparent display assembly to correspond to respective processing states of the voice signal, the display PCB is configured to, after the user's voice input or a manipulation of a menu button, convert the initial screen into a voice input standby screen , the voice input standby screen being configured to display a status bar indicating a ready state to receive voice command, and the voice input standby screen is configured to become more opaque than the initial screen to clearly display the status bar when being converted into the voice input standby screen from the initial screen . a cabinet defining a storage space; a door for opening and closing the cabinet ; a transparent display assembly which covers an opened see-through part of the door , being configured to selectively allow an inner space of the refrigerator to be seen by outputting an initial screen ; a display PCB configured for controlling an operation of the transparent display assembly ; a voice recognition unit configured to process a user's voice signal; and a microphone for receiving a user's voice input, being connected to the voice recognition unit , characterized in that : the display PCB is configured to, according to the user's voice signal, output various screens on the transparent display assembly to correspond to respective processing states of the voice signal, the display PCB is configured to, after the user's voice input or a manipulation of a menu button, convert the initial screen into a voice input standby screen , the voice input standby screen being configured to display a status bar indicating a ready state to receive voice command, and the voice input standby screen is configured to become more opaque than the initial screen to clearly display the status bar when being converted into the voice input standby screen from the initial screen . the display PCB is configured to, according to the user's voice signal, output various screens on the transparent display assembly to correspond to respective processing states of the voice signal, the display PCB is configured to, after the user's voice input or a manipulation of a menu button, convert the initial screen into a voice input standby screen , the voice input standby screen being configured to display a status bar indicating a ready state to receive voice command, and the voice input standby screen is configured to become more opaque than the initial screen to clearly display the status bar when being converted into the voice input standby screen from the initial screen . <EOS>