Pointing device and wireless terminal for reducing power consumption by supplying power only when a contact is detected

A pointing device comprising:

• a displacement detection section that detects an amount of displacement and a direction of displacement of the pointing device;
• a wireless communication section coupled to a first directional antenna, a second directional antenna, a third directional antenna and a fourth directional antenna, the wireless communication section operable to transmit information of the amount of displacement and the direction of displacement which are detected by the displacement detection section as a radio signal;
• at least one contact detection section placed at a position to detect the presence or the absence of a contact of the right hand or the left hand of a user that grips the pointing device;
• a power source control section that, while the at least one contact detection section detects any contact, supplies electric power to the wireless communication section and the displacement detection section, and that, while the at least one contact detection section does not detect any contact, does not supply electric power to the wireless communication section and the displacement detection section;
• the first directional antenna and the third directional antenna located on a left side of the pointing device and separated by the at least one contact section located therebetween;
• and
• the second directional antenna and the fourth directional antenna located on a right side of the pointing device and separated by the at least one contact section located therebetween;
• and
• a device control section operable
• to identify that the contact that is detected by the at least one contact detection section is either the left hand or the right hand, and
• to cause the wireless communication section to select one of the first directional antenna or the third directional antenna when the hand is identified to be the right hand, and causes the wireless communication section to select one of the second directional antenna or the fourth directional antenna when the hand is identified to be the left hand.