A portable terminal includes a first detection unit that detects a change in a position of the portable terminal; a second detection unit that detects a change in a physical quantity representing a surrounding condition of the portable terminal; and a transition unit that causes the portable terminal to transition from a first state to a second state in which electricity consumption is smaller than that of the first state, when a relation between a direction of the change detected by the first detection unit and a trend in the change in the physical quantity detected by the second detection unit satisfies a predetermined condition.