Abstract: Method and apparatus for communication between client and service provider using external server, and a method and apparatus for controlling communication between a client and a service provider are provided. The method includes: receiving from the service provider a first authentication token indicating that the service provider has authenticated communication with the client by logging on the service provider; storing, in the external server, authentication information containing the first authentication token and additional information relating to communication with the service provider; receiving, when there is a request to access the service provider, authentication information corresponding to the request from the external server; and communicating with the service provider using the received authentication information.

Abstract: Method and apparatus for communication between client and service provider using external server, and a method and apparatus for controlling communication between a client and a service provider are provided. The method includes: receiving from the service provider a first authentication token indicating that the service provider has authenticated communication with the client by logging on the service provider; storing, in the external server, authentication information containing the first authentication token and additional information relating to communication with the service provider; receiving, when there is a request to access the service provider, authentication information corresponding to the request from the external server; and communicating with the service provider using the received authentication information.

Abstract: A method of providing a dynamic content service using an analysis of a user's response, the method including: monitoring the response of the user watching and/or listening to first content; analyzing preference information with respect to one or more scenes included in the first content, based on the monitored user's response; transmitting, to an external server, metadata of the analyzed preference information; receiving, from the external server, second content generated based on the metadata of the analyzed preference information; and outputting the received second content onto a screen.