A portable terminal operates while switching first mode for generating, based on a value indicating a degree of contact output by a touchpad, a value indicating degree of the contact for each contacted area and second mode for generating, based on the output value, a value by performing adjustment such that temporal change amount of the value indicating the degree is equal to or less than a predetermined value. When a value of one contacted area generated in the second mode equals or exceeds the first threshold, the portable terminal switches to the first mode, and when a value of one contacted area generated in the first mode falls below the second threshold, the portable terminal switches to the second mode. The portable terminal determines, as a target area to which processing to be performed is allocated, one contacted area having a value that equals or exceeds the first threshold.