In an electronic unit having a stack in memory and adapted to run a plurality of tasks in accordance with a multitask operating system and to save context data in the stack, a scheduling unit schedules the plurality of tasks for wakeup so as to execute the plurality of tasks. Each of the plurality of tasks stays in at least one of a suspended state, a ready state, and a running state. A measurement unit measures an amount of space to be used in the stack during the at least one of the tasks staying in neither the running state nor the ready state.