| 摘要 |
PROBLEM TO BE SOLVED: To provide picture information save control technology for saving picture information while balancing memory capacity and a processing speed. SOLUTION: When a picture transition is instructed toward the low-order layer of a tree structure in response to the operation of a picture transit button displayed on the display source of picture information, the picture information of a transition destination is saved and when a picture transition is instructed toward the high-order layer of the tree structure, the picture information of a transition source is deleted from the picture information to be saved. At the same time, processing is performed to delete picture information positioned between that transition source picture information and the picture information of the transition destination. When returning the picture information to be displayed to the high-order layer side of the tree structure, by deleting information while considering low possibility to utilize picture information positioned on the low-order layer side again rather than that returned picture information, without exerting a considerable influence upon the processing speed, the capacity of a memory to be used for saving picture information can be reduced.
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