a computer, said computer comprising:

reception means for acquiring input information containing a program of a first data format from a communication network;

direction extract means for extracting a convert direction of a data format contained in said input information so acquired;

data conversion rule acquisition means for acquiring a conversion rule of a data format corresponding to said convert direction extracted;

convert execution means for converting the program of the first data format to a program of a second data format on the basis of said conversion rule acquired; and

transmission means for outputting the converted program to said communication network,

wherein said data format conversion equipment further comprises:

memory means for storing a conversion rule for converting the program of the first data format to the program, etc, of the second data format,

wherein said memory means stores a plurality of conversion rules for executing conversion to a plurality of different second data formats in such a manner as to correspond to at least one first data format, and said data conversion rule acquisition means acquires a conversion rule corresponding to said convert direction from said memory means, and

wherein said data conversion rule acquisition means acquires said conversion rule stored in memory means provided outside from said communication network through said reception means.