A down-converter comprises a frequency division circuit, PLL, and local oscillation circuit to convert a signal from a reference oscillation circuit to a converting reference signal with a constant frequency, and uses this signal to frequency-convert an in-building upward signal to an upward signal able to be transmitted in an external bi-directional CATV system. Through this configuration, the application software associated with the music data can be downloaded from the server to the portable telephone by the user’s selection. The decoder circuit receives the image data and the padding data, and removes the padding data from within the image data. A lookup operation is then performed in the enabled lookup units to generate the lookup result. The bow member includes a bow channel that receives the elongated member such that the cover is engaged with the bow member.