Map displaying apparatus

A map displaying apparatus comprising:

• first memory means for storing map data, including a plurality of map regions;
• input means for inputting information, specifying a destination located in one of the plurality of map regions, said information including only a telephone area code of the destination or an entire telephone number, including area code, of the destination;
• second memory means for storing first map-region-specifying data, indicating a relation between said entire telephone number and a map region in which said entire telephone number is located, and for storing second map-region-specifying data indicating a relation between said telephone area code and a map region assigned to said telephone area code;
• map-region-retrieving means for retrieving from said first memory means, the map region in which said telephone number is located according to said first map-region-specifying data when said entire telephone number is input, and for retrieving from said first memory means, a map region assigned to said telephone area code according to said second map-region-specifying data when only said telephone area code is input;
• and
• display means for displaying the map region in which said entire telephone number is located, retrieved from said first memory means according to said first map-region-specifying data, with a location corresponding to said entire telephone number superimposed onto the map region in which said entire telephone number is located when said entire telephone number is input, and for displaying the map region assigned to said telephone area code and adjacent map regions and highlighting the map region assigned to said telephone area code according to said second map-region-specifying data, when only said telephone area code is input.