Provided is an information processing system that communicates with a storage apparatus through a plurality of paths Pi (i=1 to n, where n is a total number of the paths), and that issues an I/O to the storage apparatus through one of the paths Pi. The information processing system sets weights Wi for the respective paths Pi; obtains an I/O issue interval di of each of the paths Pi by dividing a sum total ΣWi of the weights Wi by the weight Wi set for the path Pi; obtains I/O issue timings ti(m)of each of the paths Pi by using the following equation: ti(m)=di/C+m·di (m=0, 1, 2, . . . ) (where C is a constant); and issues the I/Os to the paths Pi in an order corresponding to the an order of the I/O issue timings ti(m) chronologically arranged.