A heating pad assembly includes a cover member designed for abutting the back of a user. Since the non-text region of the image data is corrected according to the background amount of the text region, an appropriate correction process can be applied on the image data according to difference in the paper sheet quality and image pickup condition. A metering valve is used as a suck-back system to retrieve the remaining fluid in the main tube and prevent residue from occurring. The rear cover portion is substantially less air pervious than the front cover portion such that a vacuum of lesser force is applied to the garment through the rear cover portion than the vacuum applied to the garment through the front cover portion. The portable device contains software for computing similarity values between a local taste profile and taste profiles downloaded from one or more of the satellites, and this information is used in choosing the content of the virtual channel. This structure improves the bonding strength of each dot with respect to the substrate.