Techniques for automatically recommending parallel execution of a SQL statement. First and second Hall elements are arranged adjacent to each other and are provided to the other one of the two members. At the time of display, the apparatus accesses the Internet by a mobile phone 150 based on the link information, acquires the map information, and displays it on an LCD 131. When the pulse voltage having the changed duty ratio is applied to the mirror element, the period of applying the voltage to the vertical comb at the oscillating time of the movable plate changes so that the phase and the oscillation angle of the oscillations of the movable plate change.