| 摘要 |
A printer comprises insertion means for inserting a printing medium to be printed by the printer; an interface (201) for connecting the printer to a host device (220); receiving means (202) for receiving data via said interface; interpreting means (203) adapted to recognize a print command and print data among the data received by said receiving means (202), to interpret the print command, and to determine that one of a front side and a back side of the printing medium that said print command indicates the print data is to be printed on; detection means (207) adapted to detect which one of said front and back sides of the printing medium is facing a predetermined direction; and control means for controlling the printer. The control means comprises comparing means (204) adapted to compare the printing medium side determined by said interpreting means (203) with that detected by said detection means; and printing means (204, 208) responsive to said comparing means (204) for printing said print data on the printing medium side detected by said detection means (207) when the printing medium sides compared by said comparing means (204) are the same and on the other side otherwise.
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