1. A display apparatus comprising: a camera configured to capture an image of a user; a storage configured to store information about stress areas on a body in accordance with corresponding postures of the user; and a processor configured to determine a posture of the user from the image captured by the camera, determine a position of one or more stress areas on the body corresponding to the determined posture based on the stored information about the one or more stress areas on the body, and process a stress-related image, in which the determined one or more stress areas are marked on an image corresponding to a figure of the user; and a display configured to display the stress-related image.