A non-transitory, computer-readable recording medium having stored therein a program for causing a computer to execute a process, the process comprising: detecting whether second data, stored in a second storage device, updated from first data stored in a first storage device has been updated, upon detecting that the second data has been updated, obtaining the second data before update from the second storage device, and storing the second data into the first storage device, and when the second data is contained in the first storage device, obtaining the second data from the first storage device, and generating third data using the second data, and the first data.