Vehicle-mounted information processing apparatus and vehicle-mounted information processing method for converting between a virtual and physical address

A vehicle-mounted information processing apparatus is mounted in a vehicle and includes: a plurality of processing units configured to execute processing in parallel; and a plurality of shared storage units that are accessible by the plurality of processing units, wherein the plurality of processing units exchange information via at least one of the shared storage units and change the at least one of the shared storage units used to exchange information, at predetermined timing. A detection unit configured to detect an abnormality for the shared storage units is also provided. The predetermined timing is the timing at which the detection unit has detected an abnormality occurred at the at least one of the shared storage units. When the detection unit has detected an abnormality occurred at the at least one of the shared storage units, the plurality of processing units may exchange information via a different shared storage unit.