The secondhand personal computer market is rapidly expanding as sharp growth in demand for new PCs sends relatively new ones to the used market.

Survey company MM Research Institute Ltd. said about 900,000 secondhand PCs were sold in fiscal 2003, up 11.1 percent over a year earlier. This fiscal year's sales are expected to register a double-digit increase to more than 1 million units.

Industry sources said users are increasingly seeking to own more than two PCs, and are looking for cheaper secondary models on the used market.