Method for recording image data and digital camera using same adapted to composite a plurality of image data and record the composite image data into a memory

A digital camera which records an image signal of a photographed object into an external memory, comprising:

• a compositor for compositing on an internal memory a plurality of image signals recorded in said external memory with one another when accepting an image compositing instruction;
• a determiner for determining whether or not a vacant capacity of said external memory is sufficient after compositing by said compositor;
• a recorder for recording into said external memory a composite image signal which is created by said compositor and stored in said internal memory when a determination result of said determiner is affirmative;
• and
• a generator for generating an alarm when the determination result of said determiner is negative, wherein when another external memory has become effective in place of said external memory for the alarm generated by said generator, said determiner determines the vacant capacity of said another external memory.