Systems and methods to provide assistance for completion during address input. A distance measurement device can provide a distance measurement utilized in adjusting the piezoelectric reflector, such that an optimal focus can be made without the use of multiple lenses andor reflectors. When a resumed playback operation is requested for the AV data, a selected last playback position is searched for, based on stored resume marks such as in a bookmark function, so as to play back the AV data from the selected last playback position.