To detect the breakage of a queue in an integrated system.

The acquisition part 71 of an operating system 51 acquires the ID and message address of a mail box supplied from a message transmitting task 52, a queue comparison part 72 compares the queue information stored in the queue information storage part 83 of a shared memory part 62 with the actual queue stored in the queue 81 to determine whether the queue is broken or not, and determines whether the message ID is under use or not, thereby detecting the broken address and a system call detecting the breakage. A queue information updating part 75 updates the queue information when the queue is updated. This invention can be applied to the integrated system.