| 摘要 |
PROBLEM TO BE SOLVED: To preserve a sound signal or a picture signal in a significant section with high quality, and to reduce the use capacity of a storage medium. SOLUTION: The sound information or picture information inputted from information input means 1 and 2 is stored in a time sequential information storing part 4. A section where the sound information stored in the time sequential information storing part 4 is matched with a preliminarily set prescribed condition is detected by a condition matching section detecting part 3. A section where user input information is present in the condition matching section among the detected condition matching sections is defined as a significant section, and the data amounts of the sound information or the picture information stored in the time sequential information storing means are compressed by a compressing means by changing compressivity or a compression system between this significant section and the other sections. The compression is operated after a preservation period in the time sequential information storing part 4 is beyond a prescribed period, or when the use capacity of the storage medium of the time sequential information storing part 4 is beyond a prescribed value, or when an empty capacity is less than the prescribed value.
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