Data processing system having a channel adapter shared by multiple operating systems

A channel adaptor is provided which can be shared by a plurality of operating systems (OS's) running in a data processing system, by generating an address translation table without changing input/output process control data. A plurality of OS's execute an input/output process for the channel adaptor by using input/output process control data having different identifiers, without sharing the input/output process control data for the channel adaptor by different OS's. The data processing system generates one virtual address translation table from a plurality of address translation tables generated by OS's, and the channel adaptor processes the input/output control data of OS's by using the virtual address translation table.