A processing method executed by a processor that receives an order from a user at a restaurant through interaction includes analyzing information indicating the order, extracting a phrase other than a standard element from the information, with reference to a first database when the extracted phrase is a first phrase in the first database, outputting a first confirmation item corresponding to the first phrase to the user, receiving a first user response corresponding to the first confirmation item, when the extracted phrase is not a first phrase in the first database, referring to a second database, when the extracted phrase is a second phrase in the second database, selecting a third phrase in the first database from second phrase-related phrases, outputting a second confirmation item corresponding to the third phrase to the user referring to the first database, and receiving a second user response corresponding to the second confirmation item.