1. A network system in which a plurality of network devices including a printing device are connected together for communication with one another and the network devices are configured for sharing and handling image data in a particular format held by at least one of the network devices, wherein: the printing device comprises: a print instruction receiving unit configured to receive print data containing font information from another network device of the plurality of network devices; a query transmitting unit configured to transmit a supply query to other network devices in the plurality of network devices, the supply query inquiring whether or not each network device is capable of supplying an identical printer font which is identical to a printer font regarding the font information contained in the print data as image data in the particular format and inquiring whether or not each network device is capable of supplying a similar printer font which contains a same character code as, and is similar to, but not identical to, the printer font regarding the font information contained in the print data; a response receiving unit configured to receive an affirmative response transmitted from one or more of said other network devices in response to the supply query, the affirmative response indicating that the supply of the identical printer font or the similar printer font regarding the supply query as image data in the particular format is possible; and a printing unit configured to print out the print data received by the print instruction receiving unit by use of the image data in the particular format held by at least one of said one or more of said other network devices which transmits the affirmative response, the plurality of network devices other than the printing device comprises: a query receiving unit configured to receive the supply query transmitted from the printing device; a font supply judgment unit configured to judge whether it is possible to supply the identical printer font or the similar printer font regarding the supply query as image data in the particular format or not in response to reception of the supply query by the query receiving unit; and a response transmitting unit configured to transmit the affirmative response to the printing device when the font supply judgment unit judges that it is possible to supply the identical printer font or the similar printer font regarding the supply query as image data in the particular format, wherein: the supply query includes only a part of the font information, and when a printer font identical to the printer font regarding the font information is not available, printer font data is created by reforming a shape by applying enhancement or changing a size of the similar printer font.
1. A network system in which a plurality of network devices including a printing device are connected together for communication with one another and the network devices are configured for sharing and handling image data in a particular format held by at least one of the network devices, wherein: the printing device comprises: a print instruction receiving unit configured to receive print data containing font information from another network device of the plurality of network devices; a query transmitting unit configured to transmit a supply query to other network devices in the plurality of network devices, the supply query inquiring whether or not each network device is capable of supplying an identical printer font which is identical to a printer font regarding the font information contained in the print data as image data in the particular format and inquiring whether or not each network device is capable of supplying a similar printer font which contains a same character code as, and is similar to, but not identical to, the printer font regarding the font information contained in the print data; a response receiving unit configured to receive an affirmative response transmitted from one or more of said other network devices in response to the supply query, the affirmative response indicating that the supply of the identical printer font or the similar printer font regarding the supply query as image data in the particular format is possible; and a printing unit configured to print out the print data received by the print instruction receiving unit by use of the image data in the particular format held by at least one of said one or more of said other network devices which transmits the affirmative response, the plurality of network devices other than the printing device comprises: a query receiving unit configured to receive the supply query transmitted from the printing device; a font supply judgment unit configured to judge whether it is possible to supply the identical printer font or the similar printer font regarding the supply query as image data in the particular format or not in response to reception of the supply query by the query receiving unit; and a response transmitting unit configured to transmit the affirmative response to the printing device when the font supply judgment unit judges that it is possible to supply the identical printer font or the similar printer font regarding the supply query as image data in the particular format, wherein: the supply query includes only a part of the font information, and when a printer font identical to the printer font regarding the font information is not available, printer font data is created by reforming a shape by applying enhancement or changing a size of the similar printer font. 3. The network system according to claim 1 , wherein: at least one of the network devices in the network system further includes a font readout unit capable of reading out printer fonts stored in a storage medium removable from the network device as image data in the particular format; and the font supply judgment unit of the network device judges that the network device is capable of supplying the identical printer font or the similar printer font regarding the supply query as image data in the particular format if the font readout unit can read out the identical printer font or the similar printer font regarding the supply query that has been stored in the removable storage medium as image data in the particular format.