a mobile radio device improves its operability with a simple configuration and facilitates the pointing operation of a pointer displayed on a screen to a desired area . first apparatus displays a first area , a second area , and a pointer on a screen . the second area is partitioned by a boundary and located outside the first area . the pointer is movable on the screen according to a user &# 39 ; s operation . second apparatus acquires position information of the pointer on the screen . third apparatus sets positional information of the first area and the second area . fourth apparatus notifies with vibration , sound , and / or light the user a fact that the pointer is moved on the screen across the boundary between the first area and the second area based on the position information of the pointer acquired by the second apparatus and the positional information of the first area and the second area set by the third apparatus .