| 摘要 |
PROBLEM TO BE SOLVED: To perform update processing of data without interrupting route guidance processing.SOLUTION: In a car navigation system 1, when a data amount of update target data in data recorded in data recording means 12 is larger than a data recording capacity of memory means 13, after accessory power supply detection means 16 detects an accessory power supply being in an OFF state, control means 15 temporarily records a certain amount of data in the memory means 13 that can be recorded in the memory means 13 in the update target data, creates new data to update partial data in the data recording means 12, and repeatedly executes update processing of partial data in the data recording means 12 until all the update target data is updated. |
