| 摘要 |
A buffer managing unit 111 dynamically changes the capacity of the buffer allotted to a user memory 14, a buffer memory 15 and an external memory 16 based on the degree of communication control data changing with data of the environment of a radio network obtained form a communication data monitoring unit 118. The buffer managing unit 111 changes the threshold value of the buffer based on the degree of communication control data and, upon reaching of the threshold value of the buffer, limits the in-flow of data with respect to the external device. It is possible to prevent data loss without preparation of any wasteful memory space.
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