To select proper data according to a use situation of data from data stored in a first storage means, and to make them be stored in a second storage means, when an information processor transfers to a power saving mode.

In this information processor, a CPU 201 selects the data on a HDD 6 to be transferred onto a memory area 410 of a nonvolatile memory 205 shown in Fig.4 in S302. In S303, the CPU 201 transfers the selected data onto the memory area 410.