An information processor includes a CPU, a primary storage unit, a secondary storage unit, a cache memory, and a cache controller. The primary storage unit stores the at least one program and data. The data is used by at least one process generated by execution of the at least one program in the CPU. The secondary storage unit stores the at least one programs and the data. The secondary storage unit has a lower access speed than an access speed of the primary storage unit. The cache memory caches the data. The at least one process exchanges the data between the primary storage unit and the secondary storage unit. The cache controller controls the caching of the data based on caching necessity information, the caching necessity information being determined for each of the processes and indicating whether the caching of the data is necessary or not.