| 摘要 |
PROBLEM TO BE SOLVED: To allow the single communication equipment of a mobile object to communicate through the use of plural communication systems. SOLUTION: This communication equipment of a mobile object is added with a function corresponding to plural communication systems, a function judging whether communication systems equipped for the communication equipment of a mobile object are usable or not, a function judging and ordering which one of the plural communication systems equipped for the communication equipment of a mobile object is stably usable and what order it is stably usable, and a function to allow the communication equipment of a mobile object to judge a more stable communication system to switch a corresponding system, to automatically, semiautomatically or manually select and switch a system. Thereby user's operability is improved.
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