| 摘要 |
A meta-information-read unit, a display-cache unit, a pre-reading-cache unit, a display-state-management unit, an operation-input unit, a meta-information-pre-reading unit, and an input-operation-determination unit are provided. The meta-information-pre-reading unit changes a pre-reading condition and pre-reads meta information on the basis of a result of determination made by the input-operation-determination unit and display-state-management information managed by the display-state-management unit.
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