To improve the operability of an information processor that a user holds in his/her hand to perform various operations.

An information processor comprises a main body, a display part 2, an acceleration sensor 115, a start operation element 12 and a scroll operation control part 121. First, the scroll operation control part 121 calculates an initial inclination of the main body based on the information detected by the acceleration sensor 115 at the time of a scroll operation. Next, the scroll operation control part 121 calculates a direction and amount of change in the inclination of the main body from the initial inclination based on the information detected by the acceleration sensor 115 after the start of the scroll operation. And, the scroll operation control part 121 calculates a direction and amount of scroll of the display screen based on the calculated direction and amount of change of the main body.