Abstract: Apparatus for providing a reactive user interface, according to the present invention, comprising: a touch recognition module for receiving a user's first signal; a processor module for transmitting a second signal in response to the first signal; and a display module.

Abstract: An apparatus and method for providing information based on the presence or absence of a user input are provided. The apparatus includes a user input recognizer configured to recognize a user input, and a controller configured to, if a user input is not recognized for a predetermined time, control an output unit to output predetermined information.

Abstract: A method and apparatus for controlling a virtual object based on a touched time are provided. The apparatus includes a touch recognizing part configured to recognize a touch input on a touch screen, and an area setting part configured to set a selection area in a virtual space based on the touch input. The area setting part sets the selection area according to a first spot and a touched time, the first spot being a point at which a first touch input is applied on the touch screen and the touched time being a time period during which the first touch input is maintained.

Abstract: A method for recommending a messenger friend is disclosed. The method includes receiving at least one first contact number from a first-user terminal through a transceiver by a service server, receiving at least one second contact number from at least one second-user terminal through the transceiver by the service server, comparing the at least one first contact number with the at least one second contact number by a controller of the service server, and recommending, in the presence of the same contact number between the at least one first contact number and the at least one second contact number, the at least one second-user terminal as a friend to the first-user terminal.

Abstract: Disclosed are a system and a method for providing social relationship information about a user of various communication terminals, the system for providing social relationship information comprising: a related-person information storage unit for storing information about related-persons who are in contact with a user via a communication network; a contact record storing unit for gathering and storing communication contact records for the user and the related-persons; a relationship index calculation unit for calculating a social relationship index by analyzing the communication contact records; and a group information management unit for generating group information about the related-persons on the basis of the calculated social relationship index, and then providing the generated group information to a social network server or application.