Computer-readable recording medium, index generating apparatus, index generating method, computer-readable recording medium, retrieving apparatus, and retrieving method

A retrieving apparatus comprising:

• a processor;
• a memory, wherein the processor executes a process comprising:
• receiving a predetermined condition for retrieving a number;
• converting the received condition for retrieving the number into conditions corresponding to a plurality of value ranges of a plurality of respective attributes of the number;
• and
• retrieving the converted conditions resultant using index information indicating bitmap data in which a position at which the number appears is mapped to each of the value ranges of the respective attributes.

A retrieving method to be executed by a computer, the method comprising:

• receiving a predetermined condition for retrieving a number using a processor;
• converting the received condition for retrieving the number into conditions corresponding to a plurality of value ranges of a plurality of respective attributes of the number using the processor;
• and
• retrieving the converted conditions using index information indicating bitmap data in which a position at which the number appears is mapped to each of the value ranges of the respective attributes using the processor.