A pseudo-image signal producing section produces a pseudo-image signal imitating an actual image signal. A gaseous desulfurizing compound is bubbled through the molten alloy to form a solid sulfur-containing waste phase and a molten reduced-sulfur alloy phase. The data driver also includes switches for selectively coupling the data line to a driver unit or an analog to digital converter unit. When the predetermined time passes without key input, character selection fixing section 201 reads aloud the present candidate character stored in present candidate storage section 202, outputs the present candidate character to reading determination section 206 as a fixed character, and voice reproduction section 105 reproduces the voice corresponding to the fixed character.