| 摘要 |
An object of the present invention is to assemble all modules of a data broadcast via the internet access, when the receiving conditions of radio waves become poor due to, for example, bad weathers. When a reception condition monitoring means 6 determines that the receiving conditions become poor, reception method changing means 7 switches on an internet access means 10. At this time, a module detection means 8 acquires a module list registered in advance in a module memory means 4 to detect a module which has not been received so as to acquire only this module which has not been received by the internet access.
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