Image forming apparatus and method of controlling image forming apparatus which adapt to various OSes/IPP print functions

An image forming apparatus comprising:

• a communicator which transmits and receives various kinds of data to and from an external user terminal via a network;
• an image former which forms an image based on image data received from the user terminal;
• a storage which stores a first correspondence table in which a print operation based on a predetermined print protocol is associated for each of various operating systems of the user terminal;
• a packet data analyzer which analyzes packet data of the print protocol;
• and
• one or more controllers which control the communicator, the image former, the storage, and the packet data analyzer, wherein:
• when the communicator receives packet data of the print protocol from the user terminal, the one or more controllers cause the packet data analyzer to analyze the packet data and specify a type of the operating system of the user terminal;
• when the type of the operating system of the user terminal was able to be specified, the one or more controllers decide on the print operation based on the print protocol associated with the operating system by referring to the first correspondence table;
• and
• when the communicator receives image data by the print protocol from the user terminal thereafter, the one or more controllers cause the image former to form an image based on the image data in accordance with the print operation that has been decided.