Digital map display zooming method, digital map display zooming device, and storage medium for storing digital map display zooming program

A digital map display zooming device for enlarging and reducing a displayed portion of a digital map as map information in digital form within a display screen, said device by comprising:

• display means having a display screen for displaying said displayed portion of said digital map;
• a scale setting part provided to be displayed at said display screen of said display means, said scale setting part comprising a scroll part having a shifting operation part and being displayed at said display screen with a function thereof being changed for shifting said displayed portion, and carrying out enlarging and reducing operations of said displayed portion of said digital map within said display screen by operating said shifting operation part;
• pointing means for operating said shifting operation part of said scale setting part;
• and
• arithmetic processing means for carrying out processing for enlarging and reducing operations of said displayed portion of said digital map within said display screen by shifting said shifting operation part of said scale setting part with said pointing means being operated.