Electronic apparatus, control method thereof, remote control apparatus, and control method thereof

An electronic system comprising:

• a first electronic apparatus comprising:
• a plurality of buttons comprising a plurality of direction keys;
• a sensing unit operable in one of an active mode and a power saving mode, configured to sense a movement of the first electronic apparatus;
• the sensing unit comprising at least one from among a gyro sensor, an acceleration sensor, and a geomagnetic sensor;
• a first communication unit configured to establish communication with a second electronic apparatus;
• and
• a first control unit configured to transmit information corresponding to the movement of the first electronic apparatus which is sensed by the sensing unit in the active mode, the information being transmitted to the second electronic apparatus via the first communication unit, and
• the second electronic apparatus comprising:
• a display;
• a second communication unit configured to establish communication with the first electronic apparatus;
• and
• a second control unit configured to control the display to display a pointer in a pointing mode based on the information corresponding to the movement of the first electronic apparatus transmitted from the first electronic apparatus and in response to switching from the pointing mode to a non-pointing mode, to transmit a control signal via the second communication unit to the first electronic apparatus so that the sensing unit operates in the power saving mode,
• wherein the sensing unit consumes less power in the power saving mode than in the active mode.