Abstract: A bid-price determination apparatus includes an acquirer, an extractor, a predictor, a determiner, and an output device. The acquirer acquires a price history of a product before a current time in an electric power continuous session. The extractor extracts, from the acquired price history, a first feature quantity which is a feature quantity of the price history of the product. The predictor predicts, based on the extracted first feature quantity, a second feature quantity which is a feature quantity of price changes of the product after the current time. The determiner determines, based on the predicted second feature quantity, a transaction standard value which is a standard for a transaction of the product after the current time. The output device outputs the determined transaction standard value.