COMMUNICATION NAVIGATION SYSTEM, SERVER APPARATUS, TERMINAL APPARATUS, AND DATA STRUCTURE IN NAVIGATION INFORMATION

摘要

PROBLEM TO BE SOLVED: To provide a communication navigation system that can improve the versatility of information that is sent and received, and at the same time that can cope with a situation when specifications are changed in a server apparatus or a terminal apparatus by changing only a portion corresponding to the change. SOLUTION: With the data structure of information that is transmitted and received in a communication navigation system including the server apparatus and the terminal apparatus, the package P as the unit of information is composed of a data code DC for indicating the attribute of a data body DB that is the information itself, size information DS for indicating the amount of information of the package P including the data body DB, and the data body DB regarding all types of pieces of information.