Abstract: Provided are a method and device for setting control authority and providing additional information when content is shared. A device control method for controlling a user device having a display includes displaying content on the display of the user device by using a screen sharing service for sharing the displayed content with an external device; transmitting control authority setup information indicating that the user device has control authority of the screen sharing service, to the external device; and transmitting a control command associated with the screen sharing service to the external device according to the control authority.

Abstract: A server, a user terminal and a method of providing service by uploading at least one content list generated by packaging a plurality of content, extracting a core content by considering a packaging frequency for each content included in the at least one content list; and recommending an extracted core content to a user if requested by a user.

Abstract: A method and system for creating a mixed world that reflects a real state is provided. The system includes a mirror world creation module which creates a mirror world that represents the structure of a real world; an object information collection module which collects real object information; and a mixed world creation module which creates a mixed world by reflecting the real object information into the mirror world.

Abstract: Provided is an information search apparatus and method. The method includes extracting first information and second information from specific information that is received; determining whether the second information satisfies specific conditions; generating a query by combining the second information and the first information if it is determined that the second information satisfies the specific conditions; and transmitting the generated query to a terminal.