A microwavable product can include a first food product in a package, and a flow-capable butter-syrup compound in the package adapted to remain solid prior to heating. The information processing method includes an obtaining step of obtaining from the monitoring unit an acquiring method for acquiring the retained information; an acquiring step of acquiring the retained information in accordance with the obtained acquiring method; and a display controlling step of allowing a display unit to perform a display based on the information acquired in the acquiring step. A timing generating circuit calculates a frequency error with reference to a frame timing correction amount from a delay profilesearch circuit, and produces an unlock signal if the frequency error becomes equal to or greater than the predetermined value.