Disclosed herein is a system for inquiring about fitness of a beverage as battery fuel, including a search request receiving section configured to receive an input of beverage information regarding a beverage as a search request, a storage section having stored therein a reference database in which search requests and performance data of fuel cells are associated with each other, a search section configured to automatically search the reference database for performance data which coincides with the search request, and a search answer outputting section configured to output a search answer.