Abstract: An in-vehicle communication device 300 that automatically answers a caller device that sends a call when a telephone device 100 located in a vehicle receives the call comprising: in-vehicle sensors 311˜316 that detect vehicle conditions, a communication interface 340 for the telephone device 100, and a control device 380 that controls the telephone device 100 via the communication interface 340, wherein the control device 380 acquires the vehicle conditions which are detected by the in-vehicle sensors 311˜316, judges whether a driver's answering the call is dangerous or not based on the acquired vehicle conditions when the control device 380 detects the call to the telephone device 100, prepares an answer message including vehicle information that depends upon a running condition of the vehicle at the time when the driver's answering the call is judged to be dangerous, and sends the prepared answer message to the caller device.

Abstract: An information terminal 1 is provided with a first input section 11, a position detector 12, a first arithmetic operation section 13, a data storage section 15, a first data reader 18, a connection information generator 17, and a first output section 16. The data storage section 15 stores cartographic data having the data structure simplified but capable of recovering information about connection among nodes and links constructing a road network. The connection information generator 17 complements the connection information of the cartographic data. The first arithmetic operation section 13 uses the connection information complemented by the connection information generator 17 to carry out data processing for various purposes, such as route search and position detection.