To solve a problem that voice information or image information accompanying voice information is difficult to retrieve.

This device is provided with a voice-text conversion means 2 for converting a voice input into a text by using voice recognition software. A date-and-hour information generating means 3 is provided for generating date-and-hour information in the form of text. The voice text is divided into segments, the date-and-hour text is added to each of the segments to be stored.