Program compilation execution system

There is provided a program compilation execution system which uses an in-task shared data allocation system in which by allocating only the data used in a task on a main memory, the operation efficiency of main memory can be enhanced. A compiler 20 transmits to an object program 40 the group information for a variable designated in a source program 10. A linker 50 continuously allocates variables belonging to the same group in each group, and transmits a memory allocation size information of each group to an execution format file 70. When generating the task, a program execution portion 80 obtains from the execution format file the allocation size information relative to the group information designated in an argument, and allocates a region of an in-task shared variable on a memory.