Learning device

A learning device comprising:

• an information processing unit;
• a characteristic input means, operatively connected with said information processing unit, for inputting characters;
• an information storage means, operatively connected with said information processing unit, for storing a variety of data;
• a first visual information display means, operatively connected with said information processing unit, for displaying characters and figures;
• a location designation means, operatively connected with said information processing unit, for designating a specific location on said first visual information display means;
• a learning material storage means for storing a plurality of learning materials of which respective learning items has a tree structure;
• a tree structure storage mans for storing said tree structure of said learning items, a name of each learning item, names of learning items positioned at next upper and next lower levels in said tree structure, and a name of a learning material corresponding to said each learning item;
• a display instruction means for instructing said first visual information display means to display at least a portion of said tree structure with reference to information stored in said tree structure storage means in response to at least one of a first character input by said character input means and a first location designation by said location designation means;
• a tree structure display range alteration means for altering a range of said tree structure displayed on said first visual information display means with reference to said information in response to at least one of a second character input by said character input means and a second location designation by said location designation means;
• and
• a learning material calling means for reading from said tree structure storage means a learning material name of one of said learning items displayed on said first visual information display means and calling a learning material having said learning material name from said learning material storage means, said one of said learning items being designated by said location designation means.