Handheld electronic device and remote control method

A handheld electronic device, comprising:

• a display unit;
• an electronic compass for measuring a plurality of origin direction information directed towards a plurality of reference locations from an origin location, wherein the reference locations are correlated with the controlled device, and a plurality of move direction information directed towards the reference locations from a move location are measured when moving from the original location to the move location;
• a processing unit coupling with the electronic compass and the display unit, wherein the processing unit, according to the origin location, the move location, these origin direction information and these move direction information, constructs a coordinate system and calculates the reference locations for a plurality of reference location coordinates in the coordinate system, and after the coordinate system is constructed, the electronic compass measures a current direction information directed towards the controlled device to be remote controlled from a current location, and the processing unit, according to the coordinate system, the reference location coordinates and the current direction information, controls the display unit to display a control interface of the controlled device to be remote controlled;
• and
• an input unit coupling with the processing unit for receiving a current-related location related to the current location in response to an indoor layout;
• wherein the processing unit calculates a plurality of candidate direction information respectively directed toward the reference location coordinates from the current-related location, and selects the candidate direction information closest to the current direction information for controlling the display unit to display a control interface of the controlled device to be remote controlled.