An information processing device comprising a data record medium access unit into which a data record medium, which has a first operation mode and a second operation mode as operation modes and has a first sub-operation mode and a second sub-operation mode as sub-operation modes of the second operation mode, is inserted and which gains access to the inserted data record medium, wherein it is necessary to stop power supply to the data record medium when the access to the data record medium is switched between the first operation mode and the second operation mode, but it is not necessary to stop the power supply to the data record medium when the access to the data record medium is switched between the first sub-operation mode and the second sub-operation mode and a selection unit which allows a user to select a type of access to the data record medium inserted into the data record medium access unit, wherein the information processing device is able to select an operation mode having a fastest data transmission rate among operation modes in which a newly detected data record medium is operable on the basis of a mode selection table.