Information reproducing apparatus

An apparatus for identifying one of a plurality of information units recorded on a recording medium, and reproducing the identified one of the plurality of information units, the plurality of information units being arranged in a hierarchical structure having a plurality of levels, the plurality of information units being divided into a plurality of groups, the plurality of groups being respectively assigned to the plurality of levels, the apparatus comprising:

• an input device that receives an input instruction to designate one of the plurality of information units;
• a number determination device that determines the number of the information units included in each of the plurality of groups;
• a level determination device that determines, on the basis of a determination of the number determination device, one of the plurality of levels to be searched in order to identify one of the plurality of information units corresponding to the designated one of the plurality of information units;
• and
• a reproduction device that identifies one of the plurality of information units corresponding to the designated one of the plurality of information units by searching one of the plurality of levels determined by the level determination device, and reproduces the identified one of the plurality of information units.