A video wall security system and a video wall security method are provided. The video wall security system includes at least one processor to implement a central controller configured to receive, from a monitoring system, an identifier of a camera and a video stream, and generate layout setting information of a video wall to control a layout of the video wall, based on the identifier, a gateway configured to generate mapping information based on the layout setting information of the central controller, an internet protocol (IP) wall controller configured to transmit the mapping information to each of screens of the video wall, and control the screens to load the video stream based on the identifier, and a decoder configured to decode the loaded video stream, and display the decoded video stream on the screens.