Patent ID: 8633910

Claim:
An information processing device, comprising: a first casing; a second casing provided to be foldably coupled to the first casing; a detection unit configured to detect at least one of a contact by an operation input and a proximity of the operation input with respect to an operation surface provided upon the first casing, and also detect a proximity of the second casing with respect to the operation surface; and a control unit configured to extract a proximity variation component based on the detected proximity of the second casing with respect to the operation surface, the proximity variation component varying along with a change in proximity of the second casing with respect to the operation surface when the second casing is foldably moved with respect to the first casing, and determine a relative angle between the first casing and the second casing based on the proximity variation component, wherein the proximity variation component gradually changes as a function of distance from a folding axis along which the first casing and the second casing are joined.