A self-retaining suture comprises a composite filament. The sleeve also includes a restraining sheath which covers the inflatable jacket and is at least partially formed by essentially inextensible fibers including peripheral fibers which each extend around the longitudinal axis, the peripheral fibers adopting a pleated configuration for the rest configuration of the jacket and a stretched configuration for the maximum inflation configuration thereof. The program collects client profile information and costs that the client knows. A second correction condition calculating unit calculates, for the similar natural images being similar to each other, a correction condition for making image qualities of the similar natural images substantially uniform. On the receiving end, a value for the transmission quality is determined for the first and for the second voice data packet and the one of the two voice data packets is processed that has the better transmission quality.