When an interruption instruction occurs in an information processing apparatus including a CPU and a coprocessor, execution of a single dedicated instruction “GETACX Dm,Dn” performs saving of necessary data from all registers. “Dm” is a value output from a general register group 104 to a first data input bus 120. Each of calculation units implemented in a coprocessor 110 recognizes a value stored therein. If a value “Dm” specifies one of the calculation units, the specified calculation unit outputs, to a selector 116, data stored in a register included in the specified calculation unit. An implemented calculation unit information output circuit 117 stores therein the count of the calculation units implemented in the coprocessor 110. If a value of the first data input bus 120 is greater than the count of the calculation units, the implemented calculation unit information output circuit 117 outputs a value “1” to a flag register 102. Based on the fact that the value stored on the flag register 102 is “1”, a CPU 100 recognizes that saving of the data from the register has been completed.