Contents acquiring device, contents acquiring method, contents server and contents acquiring system

A contents acquiring system comprising:

• a contents acquiring device for transmitting an acquisition request of contents to be an acquisition request object prestored through a network when the contents are out of a valid expiration to be an update expiration of the contents set based on a valid term of the contents and for receiving contents corresponding thereto;
• and
• a contents server for reading contents corresponding to an acquisition request transmitted from the contents acquiring device from contents in various fields which are prestored, and for transmitting the contents corresponding to the acquisition request to the contents acquiring device through the network.

A contents acquiring system comprising:

• a contents acquiring device including cache means for temporarily storing received contents, acquisition request accepting means for accepting an acquisition request for contents, cache deciding means for deciding whether the contents requested by the acquisition request are stored in the cache means or not, valid expiration setting means for setting a valid expiration as an update expiration of the contents based on a valid term added to the contents when it is decided by the cache deciding means that the contents are stored in the cache means, acquisition request transmitting means for transmitting the acquisition request for the contents when the contents are out of the valid expiration set by the valid expiration setting means, and contents receiving means for receiving contents based on the acquisition request transmitted from the acquisition request transmitting means;
• and
• a contents server including contents storing means for previously storing contents, acquisition request receiving means for receiving an acquisition request transmitted from the acquisition request transmitting means, and contents transmitting means for fetching the contents requested by the acquisition request received by the acquisition request receiving means from the contents storing means and for transmitting the contents to the acquisition request.