Abstract: Provided are an electronic system of a real-time operating system, an operating method thereof, and an operating method for a memory device. The operating method comprising obtaining a call graph by performing static code analysis on at least one thread that corresponds to a task, obtaining a stack usage of the thread and a call probability for each node by performing runtime profiling of the call graph, allocating a threshold value of a stack size for a first memory area by taking into account the call graph, the call probability for each node, and the stack usage, expanding and storing a stack from the first memory area to a second memory area according to a comparison result between the threshold value and a stack usage of the first memory area and returning the stack to the first memory when execution is completed in the second memory area, wherein the electronic system comprises a memory device configured to include the first memory area and the second memory area.

Abstract: A method and apparatus for a portable terminal intuitively and easily inputs receiver information of a text message for use when the portable terminal transmits the text message to others or replies to the text message. The receiver information inputting method includes extracting and displaying a preset number of items, in response to a request to input receiver information; calling receiver information linked to an item that is selected from among the items; and inputting the called receiver information in a receiver information input field.