PORTABLE DEVICE, CONTROL METHOD THEREOF, AND RECORDING MEDIUM WHEREON PROGRAM IS RECORDED

摘要

A portable device with a display unit and a rear surface input unit of a touch-input type including a state assessment unit which assesses that a position designation state is applied when detecting a state a contact object is kept contacting the rear surface input unit in a prescribed time or longer; an index display unit for displaying an index on the display unit, corresponding to a position of the contact object contacting the rear surface input unit; a provisionally determined position storage unit for storing in a storage device, an index position when the contact object is removed from the rear surface input unit as a provisionally determined position; and an input determination unit which makes a definite determination of an input at the provisionally determined position stored in the provisionally determined position storage unit based on a definite determination operation.