Abstract: A digital signage system with hair/skin care diagnosis function is provided that includes a microscope unit configured to scan hair/skin of a user and acquires hair/skin image and video data, a process unit coupled to the microscope unit, and configured to process the hair/skin image and video data, and a display unit coupled to the process unit, and configured to display a plurality of windows for displaying advertisements or the hair/skin image and video data and diagnosis results. When the microscope unit operates and acquires the hair/skin image and video data, the process unit switches a mode of operation of the digital signage system from a normal mode to a diagnosis mode, in which not only advertisements but also hair/skin care information related to a specific symptom of a user are displayed.