A command processing apparatus includes an LCD. A manual trick action instruction to a dog object displayed on the LCD is accepted through a touch panel. The dog object performs a trick according to the accepted trick action instruction. An arbitrary voice command is fetched by a microphone in relation to the trick action. A voice command being coincident with the fetched voice command is retrieved from among the registered voices in a RAM through a voice verification process by a CPU core. When the verification process fails, a verification result indicates “−1”. The fetched voice command is assigned to the current trick. On the other hand, if the voice command found by the verification process is the voice command that is assigned to the current trick, a degree of relation corresponding to the trick is incremented. The dog object performs a different action depending on the degree of relation.