A disclosed portable terminal includes: an inclination measurement unit that measures an inclination of the portable terminal; a change unit that change a display direction of contents to be displayed on a display screen of the portable terminal according to a state of a user holding the portable terminal; an operation interval setting unit that sets an operation interval of the change unit based on change of the inclination over time, which was measured by the inclination measurement unit; and an operation controller that causes the change unit to operate at intervals that were set by the operation interval setting unit.