Portable terminal and display control method thereof

A portable terminal having two housings that are foldable about an open axis at which said two housing are connected to each other, comprising:

• two display units provided respectively on said two housings;
• execution unit that is capable of executing an application on each of said two housings;
• detection unit that is provided on one of said two housings and that detects the posture of the housing that is provided with said detection unit;
• open angle calculation unit that places a first reference point and a second reference point on respective display screens of said two display units such that the spatial distance of said first reference point and said second reference point in a free space is constant, and that calculates the open angle between said two housings based on the length of a perpendicular line drawn from said first reference point to said open axis, the length of a perpendicular line drawn from said second reference point to said open axis, and the length of said spatial distance;
• and
• correction unit that corrects a detection value detected by said detection unit based on the open angle calculated by said open angle calculation unit and notifies an application executed on other housing of the corrected detection value.