An aspect of the present invention is a printer communicable with an external device in accordance with a predetermined communication protocol. The printer includes: a data reception unit configured to receive data containing a character string to be printed, from the external device; an acquisition unit configured to acquire extraction setting information that is information relating to a method of extracting the character string contained in the data that is received by the data reception unit; an extraction unit configured to, upon receiving the data from the external device, extract the character string from the received data, based on the extraction setting information that is acquired by the acquisition unit; and a print unit configured to print the character string that is extracted by the extraction unit, on a print medium.