Smart glasses and a method for recognizing and prompting a face are provided. The smart glasses store a database recording a plurality of profile information and business card information thereof. In the method, an image located in the field of view of the smart glasses is captured by an image capturing unit and at least one face appearing in the image is recognized. Facial features of each of the recognized faces are compared with those of the profile information in the database to find the profile information matching the facial features. In particular, if profile information matching the facial features is found, business card information corresponding to the profile information is displayed on a display unit; if profile information matching the facial features is not found, the business card information of a business card appearing in the image is recognized to associate the business card information with the recognized face.