ic card receiving power from terminal and performing process , ic card comprises storage storing first identification information uniquely assigned to ic card , acquisition unit acquiring second identification information from terminal , first timer including first change unit whose state changes with lapse of time without power , state of first change unit changing from first initial state to final state via intermediate state , first timer outputting first signal indicative of changed state of first change unit when ic card receives power , comparison unit comparing second identification information with first identification information , determining whether second identification information and first identification information are identical , and providing first initializing signal according to at least one of determined results , and controller initializing first change unit to first initial state when receiving first initializing signal , controller further controlling ic card to make it inhibit process until state of first change unit changes to intermediate state .