1. A method executed by a server to provide a mobile device with relevant information about an object in a captured image received from an image reproducing device, the method comprising: receiving, from the image reproducing device, an image captured by the image reproducing device; receiving, from the mobile device, information corresponding to an application usage history of the mobile device; determining an interest category based on the information corresponding to the application usage history; obtaining a plurality of relevant keywords corresponding to an object in the received image captured by the image reproducing device; selecting an interest keyword included in the interest category from among the plurality of obtained relevant keywords; and transmitting to the mobile device the relevant information about the object in the captured image based on the selected interest keyword.