| 摘要 |
During a communication, the radio connection quality is measured so as to detect and store a generation time, an end time, and a continuation time of quality degradation. Upon a communication end, the end cause is judged. If the communication end is caused by a user operation, a causal connection between the communication end and the quality degradation is judged according to temporal relationship between the generation time of the quality degradation and the communication end time. That is, it is judged whether the communication end caused by the user operation is a phenomenon that the user has terminated the communication because of the communication quality degradation or other reason. Thus the communication end reasons are divided into at least two types and accumulated.
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