Information processing device and memory management method

The invention provides an information processing device and a memory management method. The information processing device includes a memory and a control unit. The memory is employed as a program work area. The control unit switches between a first mode and a second mode; during the first mode, detects a resident program resident in the memory, and saves information identifying the resident program, as resident program information; and during the second mode, determines whether a requestor program, requesting allocation of the work area, is the resident program or not by comparing requestor-program identifying information with the resident program information, and in succession allocates in the memory respective work areas for one or more requestor programs determined to be resident programs, wherein the requestor program is an ensured program requesting the work area. According to the invention, universal memory management can be carried out without wasting working time.