1. An information processor comprising: a number of processors comprising a first processor and a second processor; and a number of memories comprising a first memory and a second memory; at least two error handler program retaining sections which are provided at least to said first memory and said second memory and which retain an error handler program, said first processor executing the error handler program stored in said first memory, when an error occurs in one of said memories, said second processor executing the error handler program stored in said second memory, when said first processor has failed to normally complete the error handler program.