The VCIB includes a memory, a communication unit, and a processor. The memory stores beforehand pieces of execution information that are used to execute processes corresponding respectively to a plurality of APIs included in an API set that is a combination of APIs for requesting the VP to execute a predetermined function and requesting transmission of predetermined information from the VP. The communication unit receives, from the ADK, a request according to an API included in a permitted API set that the ADK is permitted to use beforehand. The processor executes a process corresponding to the request received by the communication unit by using execution information for an API relating to the request that is stored in the memory.