| 摘要 |
PROBLEM TO BE SOLVED: To rationally manage a charge and the correctness of mobile communication. SOLUTION: The mobile communication unit 41 can be provided with pre-paid IC modules 45A, 45B that have a pre-paid function that records a pre-paid monetary amount or unit data equivalent to the pre-paid monetary amount and subtracts a used monetary amount or unit data equivalent to the used momentary amount when the communication unit 41 is in use, an IC module 42 for identification that has a correctness confirmation function to confirm the correctness of the IC modules 45A, 45B, and the IC module 42 may store communication unit price data.
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